1
|
Parveen D, Yadav RK, Mondal B, Dallon M, Sarazin Y, Roy DK. Bis(diiminate)-based boron difluoro complexes: effective synthon for bis(borenium) cations. Dalton Trans 2024; 53:14139-14143. [PMID: 39145492 DOI: 10.1039/d4dt02050b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
A series of boron difluoro bis(diiminate) complexes have been prepared and used to obtain triflate substituted fluoroborane complexes. The corresponding well-defined bis(borenium) cations were subsequently synthesized and structurally authenticated. We are also presenting the first experimental and theoretical study of bis(borenium) cations that are derivative of cationic borinic acid.
Collapse
Affiliation(s)
- Darakshan Parveen
- Department of Chemistry, Indian Institute of Technology Indore, Madhya Pradesh, 453552, India.
| | - Rahul Kumar Yadav
- Department of Chemistry, Indian Institute of Technology Indore, Madhya Pradesh, 453552, India.
| | - Bijan Mondal
- Institute of Inorganic Chemistry, Universität Regensburg, Universität Strasse 31, 93040 Regensburg, Germany
| | - Marie Dallon
- Univ. Rennes, CNRS, ISCR-UMR 6226, 35000, Rennes, France
| | - Yann Sarazin
- Univ. Rennes, CNRS, ISCR-UMR 6226, 35000, Rennes, France
| | - Dipak Kumar Roy
- Department of Chemistry, Indian Institute of Technology Indore, Madhya Pradesh, 453552, India.
| |
Collapse
|
2
|
Teng YQ, Ren BH, Liu Y, Gao J, Ren WM, Lu XB. Innovative Approach to Chiral Polyurethanes: Asymmetric Copolymerization with Isocyanates. Angew Chem Int Ed Engl 2024; 63:e202404186. [PMID: 38691059 DOI: 10.1002/anie.202404186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 04/15/2024] [Accepted: 04/29/2024] [Indexed: 05/03/2024]
Abstract
The introduction of nitrogen-containing functional groups to chiral polymer backbones enables the tailoring of physical properties and offers opportunities for further post-polymerization modification. However, the substrate scope of such polymers is extremely limited because monomers having nitrogen-containing groups can change coordination state with respect to the metal centers, thus decreasing the activity and enantioselectivity and even poisoning the catalyst completely. In this paper, we report our attempts to carry out the asymmetric copolymerization of meso-epoxide with highly reactive isocyanates. In particular, we found that biphenol-linked bimetallic Co(III) complexes with multiple chiral centers are very efficient in catalyzing this asymmetric copolymerization reaction, affording optically active polyurethanes with a completely alternating nature and a high enantioselectivity of up to 94 % ee. Crucially, we identified that the steric hindrance at the phenolate ortho position of the ligand strongly influences the catalytic activity and product enantioselectivity. In addition, density functional theory calculations revealed that the highly sterically bulky substituents change the mechanism from bimetallic to monometallic, and result in the unexpected inversion of the chiral induction direction. Moreover, the high stereoregularity of the produced polyurethanes enhances their thermal stability, and they can be selectively decomposed into oxazolidinones. This study offers a versatile methodology for the synthesis of chiral polymers containing nitrogen functionalities.
Collapse
Affiliation(s)
- Yong-Qiang Teng
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024, China
| | - Bai-Hao Ren
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024, China
| | - Ye Liu
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024, China
| | - Jie Gao
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024, China
| | - Wei-Min Ren
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024, China
| | - Xiao-Bing Lu
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024, China
| |
Collapse
|
3
|
Rajput S, Sahoo RK, Sarkar N, Nembenna S. Gallium Hydride-Catalyzed Selective Hydroboration of Unsaturated Organic Substrates. Chempluschem 2024; 89:e202300737. [PMID: 38437065 DOI: 10.1002/cplu.202300737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 03/04/2024] [Accepted: 03/04/2024] [Indexed: 03/06/2024]
Abstract
The first examples of tetrasubstituted conjugated bis-guanidinate (CBG) supported monomeric and thermally stable gallium dihalides [LGaX2], (X=Cl (Ga-Cl), I (Ga-I)) and dihydride (Ga-H) [LGaH2] (where L={(ArHN)(ArN)-C=N-C=(NAr)(NHAr)}; Ar=2,6-Et2-C6H3) compounds are reported. The reaction of in situ generated LLi with 1.0 equiv. GaX3 (X=Cl, I) afforded compounds Ga-Cl and Ga-I. The reaction between Ga-Cl and Li[HBEt3] in benzene yielded the dihydride compound Ga-H. All reported compounds (Ga-Cl, Ga-I, and Ga-H) were characterized by NMR, HRMS, and single-crystal X-ray diffraction studies. Ga-H was probed for the hydroboration of carbodiimides (CDI), isocyanates, and isothiocyanates with HBpin. Compound Ga-H was also found effective for the catalytic hydroboration of imines, nitriles, alkynes, esters, and formates, affording the corresponding products in quantitative yields. Stoichiometric reactions with a CDI were performed to establish the catalytic cycle.
Collapse
Affiliation(s)
- Sagrika Rajput
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| |
Collapse
|
4
|
Shi C, Quinn EC, Diment WT, Chen EYX. Recyclable and (Bio)degradable Polyesters in a Circular Plastics Economy. Chem Rev 2024; 124:4393-4478. [PMID: 38518259 DOI: 10.1021/acs.chemrev.3c00848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2024]
Abstract
Polyesters carrying polar main-chain ester linkages exhibit distinct material properties for diverse applications and thus play an important role in today's plastics economy. It is anticipated that they will play an even greater role in tomorrow's circular plastics economy that focuses on sustainability, thanks to the abundant availability of their biosourced building blocks and the presence of the main-chain ester bonds that can be chemically or biologically cleaved on demand by multiple methods and thus bring about more desired end-of-life plastic waste management options. Because of this potential and promise, there have been intense research activities directed at addressing recycling, upcycling or biodegradation of existing legacy polyesters, designing their biorenewable alternatives, and redesigning future polyesters with intrinsic chemical recyclability and tailored performance that can rival today's commodity plastics that are either petroleum based and/or hard to recycle. This review captures these exciting recent developments and outlines future challenges and opportunities. Case studies on the legacy polyesters, poly(lactic acid), poly(3-hydroxyalkanoate)s, poly(ethylene terephthalate), poly(butylene succinate), and poly(butylene-adipate terephthalate), are presented, and emerging chemically recyclable polyesters are comprehensively reviewed.
Collapse
Affiliation(s)
- Changxia Shi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Ethan C Quinn
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Wilfred T Diment
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Eugene Y-X Chen
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| |
Collapse
|
5
|
Meelua W, Linnolahti M, Jitonnom J. Mechanism of cationic ring-opening polymerisation of ε-caprolactone using metallocene/borate catalytic systems: a DFT and NCI study on chain initiation, propagation and termination. RSC Adv 2024; 14:11715-11727. [PMID: 38605894 PMCID: PMC11008195 DOI: 10.1039/d4ra01178c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 04/01/2024] [Indexed: 04/13/2024] Open
Abstract
We present a comprehensive DFT investigation on the cationic ring-opening polymerisation (CROP) of ε-caprolactone (CL) using zirconocene/borate catalyst systems. All possible pathways of the interaction between cationic species [Cp2ZrMe+] and counteranions, [A-] = [MeB(C6F5)3]- and [B(C6F5)4]-, were examined during chain initiation, propagation, and termination steps. The calculations reveal an active chain-end mechanism with O-alkyl bond cleavage of the polymerisation. The catalytic performance of the two counteranions is found to be identical, and they influence the initial process through stabilisation of the cationic species via non-covalent interactions (NCI), with the [MeB(C6F5)3]- anion stabilising the catalyst-monomer complex more effectively than the [B(C6F5)4]- anion by 24.3 kJ mol-1. The first two propagations are likely the rate-determining step, with calculated free-energy barriers of 61.4-71.2 and 73.9-80.6 kJ mol-1 with and without the anions (A-), respectively. The presence of the counteranion significantly affects the third propagation rate, lowering the barriers up to 20 kJ mol-1. Comparison of the first termination and the third propagation shows that they are not competitive, with the termination being less facile. We also studied the initiation and propagation steps for the hafnocene catalyst and found that the Hf catalyst slightly favours the CL CROP in comparison to the Zr catalyst. Analysis of solvent and dispersion interaction demonstrates that both factors play an important role in the process. NCI analysis reveals weak (van der Waals) interactions at the contacts between the cationic species and the counteranions during the reaction course. Overall, our results offer insights into the structures and interactions involved in the polymerisation.
Collapse
Affiliation(s)
- Wijitra Meelua
- Demonstration School, University of Phayao Phayao 56000 Thailand
- Unit of Excellence in Computational Molecular Science and Catalysis, and Division of Chemistry, School of Science, University of Phayao Phayao 56000 Thailand
| | - Mikko Linnolahti
- Department of Chemistry, University of Eastern Finland Joensuu Campus Yliopistokatu 7 FI-80100 Joensuu Finland
| | - Jitrayut Jitonnom
- Unit of Excellence in Computational Molecular Science and Catalysis, and Division of Chemistry, School of Science, University of Phayao Phayao 56000 Thailand
| |
Collapse
|
6
|
Glenister MA, Frese JWA, Elsegood MRJ, Canaj AB, Brechin EK, Redshaw C. Reaction of Ph 2C(X)(CO 2H) (X = OH, NH 2) with [VO(OR) 3] (R = Et, nPr): structure, magnetic susceptibility and ROP capability. Dalton Trans 2024; 53:5351-5355. [PMID: 38444301 DOI: 10.1039/d4dt00078a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
Reaction of [VO(OR)3] (R = Et, nPr) with 2,2'-diphenylglycine afforded the alkoxide-bridged dimers {[VO(OR)(μ-OR)][Ph2C(NH2)(CO2)]}2, whereas use of benzilic acid, in the presence of alkali metals, afforded 16-membered metallocycles {V8(O)4M(OR)8[Ph2C(OH)(CO2)]12} (M = <1 Na, K). For the ring systems, magnetic susceptibility data is consistent with mixed-valence vanadium with an average oxidation state of 3.5. The dimer and ring systems are capable of the ring opening polymerisation (ROP) of ε-caprolactone under N2, air, or as melts affording mostly low to medium molecular weight cyclic and linear products.
Collapse
Affiliation(s)
- Mollie A Glenister
- Plastics Collaboratory, Chemistry, School of Natural Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Josef W A Frese
- Plastics Collaboratory, Chemistry, School of Natural Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Mark R J Elsegood
- Plastics Collaboratory, Chemistry, School of Natural Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Angelos B Canaj
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK
| | - Euan K Brechin
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK
| | - Carl Redshaw
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| |
Collapse
|
7
|
Meelua W, Wanjai T, Jitonnom J. Computational evaluation of zirconocene catalysts for ε-caprolactone cationic ring-opening polymerization. Sci Rep 2024; 14:3952. [PMID: 38368433 PMCID: PMC10874422 DOI: 10.1038/s41598-024-54157-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 02/09/2024] [Indexed: 02/19/2024] Open
Abstract
This quantum chemical study presents the ligand effect and a structure-property relationship in the cationic ring-opening polymerization (CROP) of ε-caprolactone using zirconocene catalysts. We first examined the effects of catalyst structure on the initiation and chain propagation steps of the CROP process. A total of 54 catalyst structures were investigated to understand the influence of the ligand structure on the stability of the catalyst-monomer complex and polymerization activity. The properties of the catalysts were analyzed in terms of ancillary ligands, ligand substituents, and bridging units. Calculations showed that the polymerization follows a proposed cationic mechanism, with ring opening occurring via alkyl-bond cleavage. A correlation between complex stability and activation energy was also observed, with ligand substituents dominating in both steps. While the ancillary ligands directly affect the HOMO energy level, the bridges are mainly responsible for the catalyst geometries, resulting in reduced complex stability and higher activation energy for the propagation step. This study contributes to a better understanding of the structural characteristics of zirconocene catalysts, which offers guidance for improving CROP activities in lactone polymerization.
Collapse
Affiliation(s)
- Wijitra Meelua
- Demonstration School, University of Phayao, Phayao, 56000, Thailand
- Unit of Excellence in Computational Molecular Science and Catalysis, and Division of Chemistry, School of Science, University of Phayao, Phayao, 56000, Thailand
| | - Tanchanok Wanjai
- Unit of Excellence in Computational Molecular Science and Catalysis, and Division of Chemistry, School of Science, University of Phayao, Phayao, 56000, Thailand
| | - Jitrayut Jitonnom
- Unit of Excellence in Computational Molecular Science and Catalysis, and Division of Chemistry, School of Science, University of Phayao, Phayao, 56000, Thailand.
| |
Collapse
|
8
|
Liang Q, Cai Y, Jiang W, Pang M, Fan L, Zhang G. Palladium-catalyzed allylation and carbonylation: access to allylhydrazones and allyl acylhydrazones. Chem Commun (Camb) 2024; 60:1638-1641. [PMID: 38235749 DOI: 10.1039/d3cc05531k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
A palladium-catalyzed allylation of hydrazines with allyl alcohols and aldehydes was developed, enabling the syntheses of a series of allylhydrazones in good to excellent yields with high regioselectivity. Furthermore, the four-component tandem allylation carbonylation of hydrazines with allyl alcohols and aldehydes was established using the catalytic system, producing various allyl acylhydrazones. Additionally, the functionalized allyl acylhydrazones could be smoothly constructed with the catalytic system employing allylhydrazones as a partner. The catalytic system exhibited good functional tolerance with excellent regioselectivities and scaled-up capability, overcoming the limitations of chemoselectivity of the multicomponent transformation and poor conversion of the weak nucleophile.
Collapse
Affiliation(s)
- Qianqian Liang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi, 030001, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Yan Cai
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030001, China
| | - Wenjun Jiang
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030001, China
| | - Mengdi Pang
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030001, China
| | - Liming Fan
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030001, China
| | - Guoying Zhang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi, 030001, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, China.
| |
Collapse
|
9
|
Yolsal U, Shaw PJ, Lowy PA, Chambenahalli R, Garden JA. Exploiting Multimetallic Cooperativity in the Ring-Opening Polymerization of Cyclic Esters and Ethers. ACS Catal 2024; 14:1050-1074. [PMID: 38269042 PMCID: PMC10804381 DOI: 10.1021/acscatal.3c05103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 12/17/2023] [Accepted: 12/19/2023] [Indexed: 01/26/2024]
Abstract
The use of multimetallic complexes is a rapidly advancing route to enhance catalyst performance in the ring-opening polymerization of cyclic esters and ethers. Multimetallic catalysts often outperform their monometallic analogues in terms of reactivity and/or polymerization control, and these improvements are typically attributed to "multimetallic cooperativity". Yet the origins of multimetallic cooperativity often remain unclear. This review explores the key factors underpinning multimetallic cooperativity, including metal-metal distances, the flexibility, electronics and conformation of the ligand framework, and the coordination environment of the metal centers. Emerging trends are discussed to provide insights into why cooperativity occurs and how to harness cooperativity for the development of highly efficient multimetallic catalysts.
Collapse
Affiliation(s)
- Utku Yolsal
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Peter J. Shaw
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Phoebe A. Lowy
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Raju Chambenahalli
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Jennifer A. Garden
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| |
Collapse
|
10
|
Banks HJS, Frese JWA, Elsegood MRJ, Redshaw C. Mixed-magnesium/zinc calix[4]arene complexes: structure, and ring opening polymerisation studies. Chem Commun (Camb) 2024; 60:304-307. [PMID: 38059516 DOI: 10.1039/d3cc04899c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Different combinations of organomagnesium reagents and zinc bromide react with either 1,3-dimethoxy-4-tert-butylcalix[4]areneH2 (L(OMe)2H2) or trialkoxycalix[4]arenes (L(OR)3H) (R = n-Pr, n-pentyl) to afford mixed-metal calix[4]arene systems. Intriguing molecular structures are formed and the systems are capable of the ring opening polymerisation of ε-caprolactone under N2, air, or as melts.
Collapse
Affiliation(s)
- Henry J S Banks
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Josef W A Frese
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Mark R J Elsegood
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Carl Redshaw
- Plastics Collaboratory, Chemistry, School of Natural Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| |
Collapse
|
11
|
Chen Y, Li B, Wang Y, Zhu X, Yuan D, Yao Y. Synthesis of Mono- and Dinuclear Aluminum Complexes Bearing Aromatic Amino-Phenolato Ligands: A Comparative Study in the Ring-Opening Polymerization of Cyclohexene Oxide. Inorg Chem 2023; 62:21247-21256. [PMID: 38053396 DOI: 10.1021/acs.inorgchem.3c03318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Dinuclear aluminum methyl complexes bearing aromatic diamine-bridged tetra(phenolato) ligands and the mononuclear aluminum methyl complex with the phenylamine-bridged bis(phenolato) ligand have been synthesized and characterized. Structure determination revealed that the Al-Al distances in these dinuclear aluminum complexes are tunable by the choice of the suitable aromatic backbone of the diamine-bridged tetra(phenolato) ligands. The catalytic behaviors of these mono- and dinuclear aluminum complexes for cyclohexene oxide (CHO) polymerization were investigated. The activities of these dinuclear Al complexes were observed to increase with the decrease of Al-Al distances, and the dinuclear Al complexes appeared to have better catalytic activity than the mononuclear Al complex, even if the Al-Al distance is as long as 9.401 Å. Dinuclear aluminum complex 2, with the shortest Al-Al distance (7.236 Å), showed the highest activity toward CHO polymerization with TOFs up to 6460 h-1 in neat CHO at 30 °C. Furthermore, comparative kinetic studies revealed that the polymerization is first-order for CHO concentration, and the reaction orders for initiator concentration are different for the mono- and dinuclear Al complexes. The polymerization mechanism study revealed that both the methyl and phenolate groups were involved in the initiation process.
Collapse
Affiliation(s)
- Yongjie Chen
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People's Republic of China
| | - Baoxia Li
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People's Republic of China
| | - Yaorong Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People's Republic of China
| | - Xuehua Zhu
- School of Chemistry and Life Science, Suzhou University of Science and Technology, Suzhou 215009, People's Republic of China
| | - Dan Yuan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People's Republic of China
| | - Yingming Yao
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People's Republic of China
| |
Collapse
|
12
|
Ganta PK, Teja MR, Chang CJ, Sambandam A, Kamaraj R, Chu YT, Ding S, Chen HY, Chen HY. Improvement of catalytic activity of aluminum complexes for the ring-opening polymerization of ε-caprolactone: aluminum thioamidate and thioureidate systems. Dalton Trans 2023; 52:17132-17147. [PMID: 37929915 DOI: 10.1039/d3dt03198e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
In this study, a series of Al complexes bearing amidates, thioamidates, ureidates, and thioureidates were synthesized and their catalytic activity for ε-caprolactone (CL) polymerization was evaluated. SPr-Al exhibited a higher catalytic activity than OPr-Al (3.2 times as high for CL polymerization; [CL] : [SPr-Al] : [BnOH] = 100 : 0.5 : 2; [SPr-Al] = 10 mM, conv. = 93% after 14 min at 25 °C), and USCl-Al exhibited a higher catalytic activity than UCl-Al (4.6 times as high for CL polymerization; [CL] : [USCl-Al] : [BnOH] = 100 : 0.5 : 2; [USCl-Al] = 10 mM, conv. = 90% after 15 min at 25 °C). Regardless of whether aluminum amidates or ureidates were present, thioligands improved the polymerization rate of aluminum catalysts. Density functional theory calculations revealed that the eight-membered ring [SPr-AlOMe2]2 decomposed into the four-membered ring SPr-AlOMe2. However, [OPr-AlOMe2]2 did not decompose because of its strong bridging Al-O bond. The overall activation energy required for CL polymerization was lower when using [SPr-AlOMe2]2 (18.1 kcal mol-1) as a catalyst than when using [OPr-AlOMe2]2 (23.9 kcal mol-1). This is because the TS2a transition state of SPr-AlOMe2 had a more open coordination geometry with a small N-Al-S angle (72.91°) than did TS3c of [OPr-AlOMe2]2, the crowded highest-energy transition state of [OPr-AlOMe2]2 with a larger N-Al-O angle (99.63°).
Collapse
Affiliation(s)
- Prasanna Kumar Ganta
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan, 80708, Republic of China.
| | - Mallemadugula Ravi Teja
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan, 80708, Republic of China.
| | - Chun-Juei Chang
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan, 80708, Republic of China.
- Department of International Ph.D. Program for Science, National Sun Yat-sen University, Kaohsiung, Taiwan 80424, Republic of China
| | - Anandan Sambandam
- Nanomaterials and Solar Energy Conversion Lab, Department of Chemistry, National Institute of Technology, Tiruchirappalli, 620015, India
| | - Rajiv Kamaraj
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan, 80708, Republic of China.
| | - Yu-Ting Chu
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan, 80708, Republic of China.
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan, 80424, Republic of China
| | - Shangwu Ding
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan, 80708, Republic of China.
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan, 80424, Republic of China
| | - Hsing-Yin Chen
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan, 80708, Republic of China.
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan, 80708, Republic of China.
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan, 80424, Republic of China
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan, Republic of China
- National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
| |
Collapse
|
13
|
Werner L, Hagn J, Walpuski J, Radius U. Aluminum(III) Cations [(NHC) ⋅ AlMes 2 ] + : Synthesis, Characterization, and Application in FLP-Chemistry. Angew Chem Int Ed Engl 2023:e202312111. [PMID: 37877231 DOI: 10.1002/anie.202312111] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 10/26/2023]
Abstract
The three-coordinate aluminum cations ligated by N-heterocyclic carbenes (NHCs) [(NHC) ⋅ AlMes2 ]+ [B(C6 F5 )4 ]- (NHC=IMeMe 4, IiPrMe 5, IiPr 6, Mes=2,4,6-trimethylphenyl) were prepared via hydride abstraction of the alanes (NHC) ⋅ AlHMes2 (NHC=IMeMe 1, IiPrMe 2, IiPr 3) using [Ph3 C]+ [B(C6 F5 )4 ]- in toluene as hydride acceptor. If this reaction was performed in diethyl ether, the corresponding four-coordinate aluminum etherate cations [(NHC) ⋅ AlMes2 (OEt2 )]+ [B(C6 F5 )4 ]- 7-9 (NHC=IMeMe 7, IiPrMe 8, IiPr 9) were isolated. According to a theoretical and experimental assessment of the Lewis-acidity of the [(IMeMe ) ⋅ AlMes2 ]+ cation is the acidity larger than that of B(C6 F5 )3 and of similar magnitude as reported for Al(C6 F5 )3 . The reaction of [(IMeMe ) ⋅ AlMes2 ]+ [B(C6 F5 )4 ]- 4 with the sterically less demanding, basic phosphine PMe3 afforded a mixed NHC/phosphine stabilized cation [(IMeMe ) ⋅ AlMes2 (PMe3 )]+ [B(C6 F5 )4 ]- 10. Equimolar mixtures of 4 and the sterically more demanding PCy3 gave a frustrated Lewis-pair (FLP), i.e., [(IMeMe ) ⋅ AlMes2 ]+ [B(C6 F5 )4 ]- /PCy3 FLP-11, which reacts with small molecules such as CO2 , ethene, and 2-butyne.
Collapse
Affiliation(s)
- Luis Werner
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Julika Hagn
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Janis Walpuski
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Udo Radius
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| |
Collapse
|
14
|
Ferrier RC, Kumbhar G, Crum-Dacon S, Lynd NA. A guide to modern methods for poly(thio)ether synthesis using Earth-abundant metals. Chem Commun (Camb) 2023; 59:12390-12410. [PMID: 37753731 DOI: 10.1039/d3cc03046f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2023]
Abstract
Polyethers and polythioethers have a long and storied history dating back to the start of polymer science as a distinct field. As such, these materials have been utilized in a wide range of commercial applications and fundamental studies. The breadth of their material properties and the contexts in which they are applied is ultimately owed to their diverse monomer pre-cursors, epoxides and thiiranes, respectively. The facile polymerization of these monomers, both historically and contemporaneously, across academia and industry, has occurred through the use of Earth-abundant metals as catalysts and/or initiators. Despite this, polymerization methods for these monomers are underutilized compared to other monomer classes like cyclic olefins, vinyls, and (meth)acrylates. We feel a focused review that clearly outlines the benefits and shortcomings of extant synthetic methods for poly(thio)ethers along with their proposed mechanisms and quirks will help facilitate the utilization of these methods and by extension the unique polymer materials they create. Therefore, this Feature Article briefly describes the applications of poly(thio)ethers before discussing the feature-set of each poly(thio)ether synthetic method and qualitatively scoring them on relevant metrics (e.g., ease-of-use, molecular weight control, etc.) to help would-be poly(thio)ether-makers find an appropriate synthetic approach. The article is concluded with a look ahead at the future of poly(thio)ether synthesis with Earth-abundant metals.
Collapse
Affiliation(s)
- Robert C Ferrier
- Michigan State University, Department of Chemical Engineering and Materials Science, East Lansing MI, USA.
| | - Gouree Kumbhar
- Michigan State University, Department of Chemical Engineering and Materials Science, East Lansing MI, USA.
| | - Shaylynn Crum-Dacon
- Michigan State University, Department of Chemical Engineering and Materials Science, East Lansing MI, USA.
| | - Nathaniel A Lynd
- University of Texas-Austin, McKetta Department of Chemical Engineering, Austin, TX, USA
| |
Collapse
|
15
|
Gupta V, Justyniak I, Chwojnowska E, Szejko V, Lewiński J. Multinuclear Zinc-Magnesium Hydroxide Carboxylates: A Predesigned Model System for Copolymerization of CO 2 with Epoxides. Inorg Chem 2023; 62:16274-16279. [PMID: 37712907 PMCID: PMC10565889 DOI: 10.1021/acs.inorgchem.3c02177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Indexed: 09/16/2023]
Abstract
Among numerous catalysts in the ring-opening copolymerization of epoxides with carbon dioxide (CO2), zinc dicarboxylate complexes are the most common type, and in the family of metal-based homogeneous catalysts, zinc and magnesium complexes have attracted widespread attention. We report on the synthesis and structural characterization of a zinc-magnesium benzoate framework templated by the central hydroxide anion with μ3-κ2:κ2:κ2 coordination mode, [ZnMg2(μ3-OH)(O2CPh)5]n (n = 1 or 2). The resulting heterometallic system forms stable Lewis acid-base adducts with tetrahydrofuran (THF) and cyclohexene oxide (CHO), which crystallize as the hexanuclear zinc-magnesium hydroxide carboxylate cluster [ZnMg2(μ3-OH)(O2CPh)5(L)2]2 (L = THF or CHO). Their X-ray crystal structure analysis revealed that the Zn center prefers 4-fold coordination and the Mg centers demonstrated the ability to accommodate higher coordination numbers, and as a result, the heterocyclic molecules are exclusively bonded to 6-fold Mg atoms. The heteronuclear carboxylate aggregates appeared active in the copolymerization reaction at elevated temperatures to produce an alternating poly(cyclohexene carbonate).
Collapse
Affiliation(s)
- Vijay Gupta
- Faculty
of Chemistry, Warsaw University of Technology, 00-664 Warsaw, Poland
| | - Iwona Justyniak
- Institute
of Physical Chemistry, Polish Academy of
Sciences, 01-224 Warsaw, Poland
| | - Elżbieta Chwojnowska
- Institute
of Physical Chemistry, Polish Academy of
Sciences, 01-224 Warsaw, Poland
| | - Vadim Szejko
- Faculty
of Chemistry, Warsaw University of Technology, 00-664 Warsaw, Poland
| | - Janusz Lewiński
- Faculty
of Chemistry, Warsaw University of Technology, 00-664 Warsaw, Poland
- Institute
of Physical Chemistry, Polish Academy of
Sciences, 01-224 Warsaw, Poland
| |
Collapse
|
16
|
Nagae H, Matsushiro S, Okuda J, Mashima K. Cationic tetranuclear macrocyclic CaCo 3 complexes as highly active catalysts for alternating copolymerization of propylene oxide and carbon dioxide. Chem Sci 2023; 14:8262-8268. [PMID: 37564411 PMCID: PMC10411860 DOI: 10.1039/d3sc00974b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 07/11/2023] [Indexed: 08/12/2023] Open
Abstract
We found that a cationic hetero tetranuclear complex including a calcium and three cobalts exhibited high catalytic activity toward alternating copolymerization of propylene oxide (PO) and carbon dioxide (CO2). The tertiary anilinium salt [PhNMe2H][B(C6F5)4] was the best additive to generate the cationic species while maintaining polymer selectivity and carbonate linkage, even under 1.0 MPa CO2. Density functional theory calculations clarified that the reaction pathway mediated by the cationic complex is more favorable than that mediated by the neutral complex by 1.0 kcal mol-1. We further found that the flexible ligand exchange between Ca and Co ions is important for the alternating copolymerization to proceed smoothly.
Collapse
Affiliation(s)
- Haruki Nagae
- Department of Chemistry, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Saki Matsushiro
- Department of Chemistry, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Jun Okuda
- Institute of Inorganic Chemistry, RWTH Aachen University Landoltweg 1 D-52062 Aachen Germany
| | - Kazushi Mashima
- Department of Chemistry, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| |
Collapse
|
17
|
Tansky M, Comito RJ. Bimetallic polymerization of lactide with binaphthol-derived bis-heteroscorpionate dizinc and dimagnesium complexes. Dalton Trans 2023. [PMID: 37318380 DOI: 10.1039/d3dt00592e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Discrete bimetallic catalysts often provide enhanced reactivity and selectivity in lactone polymerization, making metal-metal cooperativity an important design principle for new catalyst development. However, the poor modularity of binucleating ligands limits structure-reactivity analysis and optimization. This report describes a modular, binucleating bis(pyrazolyl)alkane ligand series (1-R) bridged by a chiral binaphthol unit, prepared by nucleophile-catalyzed condensation between a dialdehyde and a bis(pyrazolyl)methanone. A bis(ethylzinc) complex was characterized by single-crystal X-ray diffraction, but in situ complexation with Zn(HMDS)2 and Mg(HMDS)2 provided more active catalysts for lactide polymerization (HMDS- = hexamethyldisilazide). Structure-reactivity studies identified complexes of 1-Me2 as the most active, and these catalysts show significant enhancements in rate compared to their monometallic analogues. Kinetic analysis resulted in first-order dependence on both mono- and bimetallic catalysts, suggesting metal-metal cooperativity as the basis for this rate enhancement. End-group analysis and low dispersity implicate a coordination-insertion mechanism through an alkoxide. Despite rapid transesterification observed by MALDI, we still demonstrated controlled polymerization in the block copolymerization of ε-caprolactone and L-lactide. Although we observed rate differences in the polymerization of L-lactide by opposite enantiomer catalysts, we did not observe catalyst-directed stereoselectivity in the polymerization of rac- or meso-lactide.
Collapse
Affiliation(s)
- Maxym Tansky
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
| | - Robert J Comito
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
| |
Collapse
|
18
|
Vaillant-Coindard V, Chotard F, Théron B, Balan C, Bayardon J, Malacea-Kabbara R, Bodio E, Rousselin Y, Fleurat-Lessard P, Gendre PL. Bis(salicylamidine) Ligands (FAlen): A Variant of Salen with "à la Carte" Denticity. Inorg Chem 2023; 62:7342-7352. [PMID: 37116183 DOI: 10.1021/acs.inorgchem.3c00493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Ethylene- and phenylene-bridged bis(salicylamidine) ligands have been readily prepared from ethylene or phenylenediamine and iminium chloride derivatives generated in situ from N,N-dialkylsalicylamides. The former, in its diprotonated form (FAlenH2), reacts with AlMe3 to afford a zwitterionic dimethyldiphenoxyaluminate complex with the FAlen ligand monoprotonated and in a bidentate κ2O,O' fashion. A phenylene-bridged proligand behaves differently, yielding a neutral methylaluminum complex bearing a κ3O,N,O'-coordinated FAlen ligand. From these complexes, methyl anion abstraction with B(C6F5)3 or a reaction with Schrock's alcohol leads to the corresponding aluminum cationic or alkoxy complexes in which a κ4O,N,N',O'-coordination mode of the FAlen ligand is observed. X-ray diffraction studies of the proligands and of the complexes show that the amidine functions feature a trans configuration when the N-amidine atom is not coordinated to the metal and conversely a cis configuration when it is. Density functional theory calculations show that trans-cis isomerization of the amidine functions occurs upon coordination with the metal ion with very low energy barriers. They also confirm the intuition that the denticity of the FAlen ligands in the complexes is directly related to the electron richness of the metal ion. At last, FAlen Al complexes are used as initiators for the controlled ring-opening polymerization of rac-lactide to afford poly(lactic acid) with slight isotactic bias.
Collapse
Affiliation(s)
- Valentin Vaillant-Coindard
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Florian Chotard
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Benjamin Théron
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Cédric Balan
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Jérôme Bayardon
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Raluca Malacea-Kabbara
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Ewen Bodio
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Yoann Rousselin
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Paul Fleurat-Lessard
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| | - Pierre Le Gendre
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne, 9 avenue Alain Savary, 21000 Dijon, France
| |
Collapse
|
19
|
Boumekla Y, Xia F, Vidal L, Totée C, Raynaud C, Ouali A. Calcium-catalysed synthesis of amines through imine hydrosilylation: an experimental and theoretical study. Org Biomol Chem 2023; 21:1038-1045. [PMID: 36625298 DOI: 10.1039/d2ob02243e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A method to reduce aldimines through hydrosilylation is reported. The catalytic system involves calcium triflimide (Ca(NTf2)2) and potassium hexafluorophosphate (KPF6) which have been shown to act in a synergistic manner. The expected amines are obtained in fair to very high yields (40-99%) under mild conditions (room temperature in most cases). To illustrate the potential of this method, a bioactive molecule with antifungal properties was prepared on the gram scale and in high yield in environmentally friendly 2-methyltetrahydrofuran. Moreover, it is shown in this example that the imine can be prepared in situ from the aldehyde and the amine without isolating the imine. The mechanism involved has been explored experimentally and through DFT calculations, and the results are in accordance with an electrophilic activation of the silane by the calcium catalyst.
Collapse
Affiliation(s)
| | - Fengjie Xia
- ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France.
| | - Lucas Vidal
- ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France.
| | - Cédric Totée
- ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France.
| | | | - Armelle Ouali
- ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France.
| |
Collapse
|
20
|
Kamavichanurat S, Jampakaew K, Hormnirun P. Controlled and effective ring-opening (co)polymerization of rac-lactide, ε-caprolactone and ε-decalactone by β-pyrimidyl enolate aluminum complexes. Polym Chem 2023. [DOI: 10.1039/d3py00036b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
A series of β-pyrimidyl enolate aluminum complexes (1–6) were found to promote controlled and living ROP of rac-LA, ε-CL, and ε-DL. Six well-defined diblock copolymers and the perfect random copolymer poly(l-LA-r-CL) were successfully synthesized.
Collapse
|
21
|
Ring-opening polymerization of cyclic esters mediated by zinc complexes coordinated with benzotriazo-based imino-phenoxy ligands. POLYMER 2023. [DOI: 10.1016/j.polymer.2023.125687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
22
|
Raman Study of Block Copolymers of Methyl Ethylene Phosphate with Caprolactone and L-lactide. Polymers (Basel) 2022; 14:polym14245367. [PMID: 36559733 PMCID: PMC9782745 DOI: 10.3390/polym14245367] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 11/27/2022] [Accepted: 12/03/2022] [Indexed: 12/13/2022] Open
Abstract
We present an in-depth analysis of Raman spectra of novel block copolymers of methyl ethylene phosphate (MeOEP) with caprolactone (CL) and L-lactide (LA), recorded with the excitation wavelengths of 532 and 785 nm. The experimental peak positions, relative intensities and profiles of the poly(methyl ethylene phosphate) (PMeOEP), polycaprolactone (PCL) and poly(L-lactide) (PLA) bands in the spectra of the copolymers and in the spectra of the PMeOEP, PCL and PLA homopolymers turn out to be very similar. This clearly indicates the similarity between the conformational and phase compositions of PMeOEP, PCL and PLA parts in molecules of the copolymers and in the PMeOEP, PCL and PLA homopolymers. Experimental ratios of the peak intensities of PMeOEP bands at 737 and 2963 cm-1 and the PCL bands at 1109, 1724 and 2918 cm-1 can be used for the estimation of the PCL-b-PMeOEP copolymers chemical composition. Even though only one sample of the PMeOEP-b-PLA copolymers was experimentally studied in this work, we assume that the ratios of the peak intensities of PLA bands at 402, 874 and 1768 cm-1 and the PMeOEP band at 737 cm-1 can be used to characterize the copolymer chemical composition.
Collapse
|
23
|
Laiwattanapaisarn N, Virachotikul A, Chumsaeng P, Jaenjai T, Phomphrai K. Ring-Opening Co- and Terpolymerization of Epoxides, Cyclic Anhydrides, and l-Lactide Using Constrained Aluminum Inden Complexes. Inorg Chem 2022; 61:20616-20628. [DOI: 10.1021/acs.inorgchem.2c03532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Affiliation(s)
- Nattiya Laiwattanapaisarn
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| | - Arnut Virachotikul
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| | - Phongnarin Chumsaeng
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| | - Tiphanan Jaenjai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| | - Khamphee Phomphrai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| |
Collapse
|
24
|
Stereoselective synthesis of biodegradable polymers by salen-type metal catalysts. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1377-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
25
|
Gomri C, Cretin M, Semsarilar M. Recent progress on chemical modification of cellulose nanocrystal (CNC) and its application in nanocomposite films and membranes-A comprehensive review. Carbohydr Polym 2022; 294:119790. [DOI: 10.1016/j.carbpol.2022.119790] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 06/11/2022] [Accepted: 06/24/2022] [Indexed: 12/11/2022]
|
26
|
Glöckler E, Ghosh S, Schulz S. β-Diketiminate and β-Ketoiminate Metal Catalysts for Ring-Opening Polymerization of Cyclic Esters. POLYM REV 2022. [DOI: 10.1080/15583724.2022.2121837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Eduard Glöckler
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
| | - Swarup Ghosh
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
| | - Stephan Schulz
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
- Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany
| |
Collapse
|
27
|
Almendros P, Esteban P, Herrera F, San Martín D, Luna A. Regioselectivity Switch Based on the Stoichiometry: Stereoselective Synthesis of Trisubstituted Vinyl Epoxides by Cu‐Catalyzed 3‐exo‐trig Cyclization of α‐Allenols. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
28
|
Feng C, Mu D, Zhu X, Wang Y, Yuan D, Yao Y. Synthesis of Benzoxazine Functionalized Amine‐Bridged Bis(phenolato) Rare Earth Complexes and Their Application in Ring‐Opening Polymerization of
rac
‐Lactide. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202200353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chunping Feng
- Key Laboratory of Organic Synthesis of Jiangsu Province, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus Soochow University Suzhou 215123 China
| | - Debao Mu
- Key Laboratory of Organic Synthesis of Jiangsu Province, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus Soochow University Suzhou 215123 China
| | - Xuehua Zhu
- School of Chemistry and Life Science Suzhou University of Science and Technology Suzhou 215009 China
| | - Yaorong Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus Soochow University Suzhou 215123 China
| | - Dan Yuan
- Key Laboratory of Organic Synthesis of Jiangsu Province, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus Soochow University Suzhou 215123 China
| | - Yingming Yao
- Key Laboratory of Organic Synthesis of Jiangsu Province, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus Soochow University Suzhou 215123 China
| |
Collapse
|
29
|
Gu Z, Comito RJ. Binucleating Bis(pyrazolyl)alkane Ligands and Their Cationic Dizinc Complexes: Modular, Bimetallic Catalysts for Ring-Opening Polymerization. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zipeng Gu
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Robert J. Comito
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| |
Collapse
|
30
|
Zabalov MV, Mankaev BN, Egorov MP, Karlov SS. DFT study of the role of substituents in tin(II) bis(amidoethyl)amine complexes used for ε-caprolactone polymerization. MENDELEEV COMMUNICATIONS 2022. [DOI: 10.1016/j.mencom.2022.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
31
|
Xing T, Derbyshire M, Elsegood MRJ, Redshaw C. Mixed-metal calix[8]arene complexes: structure, and ring opening polymerisation studies. Chem Commun (Camb) 2022; 58:7427-7430. [PMID: 35696201 DOI: 10.1039/d2cc02236b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of différent combinations of group V alkoxides or tungsten oxyalkoxide salts with p-tert-butylcalix[8]areneH8 (L8H8) affords mixed-metal calix[8]arene systems. Intruiging molecular structures are formed and the systems are capable of the ring opening polymerisation of ε-caprolactone under N2, air, or as melts affording mostly low molecular weight products.
Collapse
Affiliation(s)
- Tian Xing
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Max Derbyshire
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Mark R J Elsegood
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| |
Collapse
|
32
|
Song PD, Xia L, Nie X, Chen G, Wang F, Zhang Z, Hong CY, You YZ. Synthesis of poly(thioester sulfonamide)s via the Ring-Opening Copolymerization of Cyclic Thioanhydride with N-Sulfonyl Aziridine Using Mild Phosphazene base. Macromol Rapid Commun 2022; 43:e2200140. [PMID: 35578395 DOI: 10.1002/marc.202200140] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 04/06/2022] [Indexed: 11/11/2022]
Abstract
Providing access to diverse polymer structures is highly desirable, which helps to explore new polymer materials. Poly(thioester sulfonamide)s, combining both the advantages of thioesters and amides, however, have been rarely available in polymer chemistry. Here, we report the ring-opening copolymerization (ROCOP) of cyclic thioanhydride with N-sulfonyl aziridine using mild phosphazene base, resulting in well-defined poly(thioester sulfonamide)s with highly alternative structures, high yields, and controlled molecular weights. Additionally, benefiting from the mild catalytic process, this ROCOP can be combined with ROCOP of N-sulfonyl aziridines with cyclic anhydrides to produce novel block copolymers. This article is protected by copyright. All rights reserved.
Collapse
Affiliation(s)
- Peng-Duo Song
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Lei Xia
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Xuan Nie
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Guang Chen
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Fei Wang
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Ze Zhang
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Chun-Yan Hong
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Ye-Zi You
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| |
Collapse
|
33
|
Manjarrez Y, Cheng-Tan MDCL, Fieser ME. Perfectly Alternating Copolymerization of Cyclic Anhydrides and Epoxides with Yttrium β-Diketiminate Complexes. Inorg Chem 2022; 61:7088-7094. [PMID: 35483671 DOI: 10.1021/acs.inorgchem.2c00529] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Monometallic yttrium β-diketiminate complexes are active and controlled catalysts for perfectly alternating ring-opening copolymerization of 1-butene oxide and phthalic anhydride under mild conditions. β-Diketiminate ligands with pendant neutral donors were targeted to identify both the impact of donor strength and number of donors on rates of polymerization and the presence of undesirable side reactions. Initiating groups were also varied between alkyls, chlorides, and alkoxides. In the presence of a cocatalyst, the catalysts studied were active for polymerization with minimal side reactions, whereas lack of cocatalysts led to competing homopolymerization of epoxides. While a greater donor strength and a larger number of donors both increase the rate of polymerization, donor strength generally had a bigger impact when a cocatalyst was used. Additionally, alkoxide and chloride initiators proved to be the fastest, with alkyls being more sluggish. These subtle ligand changes significantly impacting polymerization activity lend promise to the facile tunability of rare earth metal complexes to be highly active for the target copolymerization, which renders further research in this area attractive and timely.
Collapse
Affiliation(s)
- Yvonne Manjarrez
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | | | - Megan E Fieser
- Department of Chemistry and Wrigley Institute for Environmental Studies, University of Southern California, Los Angeles, California 90089, United States
| |
Collapse
|
34
|
Aluminum complexes based on 1,10-phenanthroline-containing diols: synthesis and application as initiators of polymerization of ε-caprolactone. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3470-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
35
|
Li S, Lu H, Zhu L, Yan M, Kang X, Luo Y. Ring-opening polymerization of l-lactide catalyzed by food sweetener saccharin with organic base mediated: A computational study. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124747] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
36
|
Zhu C, Burkey AA, Adams CP, Uruchurtu Patino D, Lynd NA. Concurrent Ring-Opening/Ring-Closing Polymerization of Glycidyl Acetate to Acid-Degradable Poly(ether- co-orthoester) Materials Using a Mono(μ-alkoxo)bis(alkylaluminum) Initiator. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
37
|
Yuan P, Sun Y, Xu X, Luo Y, Hong M. Towards high-performance sustainable polymers via isomerization-driven irreversible ring-opening polymerization of five-membered thionolactones. Nat Chem 2022; 14:294-303. [PMID: 34824460 DOI: 10.1038/s41557-021-00817-9] [Citation(s) in RCA: 53] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 09/21/2021] [Indexed: 11/09/2022]
Abstract
The development of sustainable polymers that possess useful material properties competitive with existing petroleum-derived polymers is a crucial goal but remains a formidable challenge for polymer science. Here we demonstrate that irreversible ring-opening polymerization (IROP) of biomass-derived five-membered thionolactones is an effective and robust strategy for the polymerization of non-strained five-membered rings-these polymerizations are commonly thermodynamically forbidden under ambient conditions, at industrially relevant temperatures of 80-100 °C. Computational studies reveal that the selective IROP of these thionolactones is thermodynamically driven by S/O isomerization during the ring-opening process. IROP of γ-thionobutyrolactone, a representative non-strained thionolactone, affords a sustainable polymer from renewable resources that possesses external-stimuli-triggered degradability. This poly(thiolactone) also exhibits high performance, with its key thermal and mechanical properties comparing well to those of commercial petroleum-based low-density polyethylene. This IROP strategy will enable conversion of five-membered lactones, generally unachievable by other polymerization methods, into sustainable polymers with a range of potential applications.
Collapse
Affiliation(s)
- Pengjun Yuan
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
| | - Yangyang Sun
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
| | - Xiaowei Xu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, China
| | - Yi Luo
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, China.,PetroChina Petrochemical Research Institute, Beijing, China
| | - Miao Hong
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China.
| |
Collapse
|
38
|
Guo R, Zhang X, Li T, Li Q, Ruiz DA, Liu LL, Tung CH, Kong L. Unraveling the reactivity of a cationic iminoborane: avenues to unusual boron cations. Chem Sci 2022; 13:2303-2309. [PMID: 35310477 PMCID: PMC8864711 DOI: 10.1039/d2sc00002d] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Accepted: 01/26/2022] [Indexed: 11/21/2022] Open
Abstract
A cationic terminal iminoborane [Mes*N
Created by potrace 1.16, written by Peter Selinger 2001-2019
]]>
B ← IPr2Me2][AlBr4] (3+[AlBr4]−) (Mes* = 2,4,6-tri-tert-butylphenyl and IPr2Me2 = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) has been synthesized and characterized. The employment of an aryl group and N-heterocyclic carbene (NHC) ligand enables 3+[AlBr4]− to exhibit both B-centered Lewis acidity and BN multiple bond reactivities, thus allowing for the construction of tri-coordinate boron cations 5+–12+. More importantly, initial reactions involving coordination, addition, and [2 + 3] cycloadditions have been observed for the cationic iminoborane, demonstrating the potential to build numerous organoboron species via several synthetic routes. An NHC-stabilized aryliminoboryl cation exhibits both boron-centered Lewis acidity and multiple bond reactivity and could be utilized as an effective synthon for unusual cationic boron species.![]()
Collapse
Affiliation(s)
- Rui Guo
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Xin Zhang
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen 518055 P. R. China
| | - Tong Li
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Qianli Li
- School of Chemistry and Chemical Engineering, Liaocheng University Liaocheng 252059 P. R. China
| | - David A Ruiz
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen 518055 P. R. China
| | - Liu Leo Liu
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen 518055 P. R. China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Lingbing Kong
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China .,State Key Laboratory of Elemento-Organic Chemistry, Nankai University Tianjin 300071 P. R. China
| |
Collapse
|
39
|
Mou Z, Xing F, Gu J. Halogenated
β‐diketiminato
magnesium complexes: Preparation, characterization, and catalysis for ring‐opening polymerization of aliphatic lactones. B KOREAN CHEM SOC 2022. [DOI: 10.1002/bkcs.12510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zehuai Mou
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Material Science and Chemical Engineering Ningbo University Ningbo Zhejiang China
| | - Fangyu Xing
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Material Science and Chemical Engineering Ningbo University Ningbo Zhejiang China
| | - Jialu Gu
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Material Science and Chemical Engineering Ningbo University Ningbo Zhejiang China
| |
Collapse
|
40
|
Chapple P, Roisnel T, Cordier M, Carpentier JF, Sarazin Y. Heteroleptic Carbazolato-Barium Hydroborates and a Related Separated Ion Pair. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
41
|
Kudo H, Nishioka S, Jin H, Maekawa H, Nakamura S, Masuda T. Thermosetting epoxy resin system: Ring-opening by copolymerization of epoxide with D,L-Lactide. POLYMER 2022. [DOI: 10.1016/j.polymer.2021.124489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
42
|
Yang R, Xu G, Dong B, Hou H, Wang Q. A “Polymer to Polymer” Chemical Recycling of PLA Plastics by the “DE–RE Polymerization” Strategy. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02085] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Rulin Yang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guangqiang Xu
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bingzhe Dong
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hongbin Hou
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
43
|
Jiang Y, Zhang W, Han M, Wang X, Solan GA, Wang R, Ma Y, Sun WH. Phenoxy-imine/-amide aluminum complexes with pendant or coordinated pyridine moieties: Solvent effects on structural type and catalytic capability for the ROP of cyclic esters. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
44
|
Chen S, Zhu L, Zhang Z. Catalyst-free aziridine-based step-growth polymerization: a facile approach to optically active poly(sulfonamide amine)s and poly(sulfonamide dithiocarbamate)s. Polym Chem 2022. [DOI: 10.1039/d2py00771a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Step-growth polymerization of chiral bis(N-sulfonyl aziridine)s with diamines or bis(dialkyldithiocarbamate) in the absence of a catalyst allows the facile synthesis of optically active polysulfonamide derivatives.
Collapse
Affiliation(s)
- Shibin Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Linlin Zhu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Zhen Zhang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Key Laboratory of Polymer Processing Engineering (South China University of Technology), Ministry of Education, Guangzhou 510641, P. R. China
| |
Collapse
|
45
|
Bonnin Q, Edlová T, Sosa Carrizo ED, Fleurat-Lessard P, Brandès S, Cattey H, Richard P, Le Gendre P, Normand AT. Coordinatively Unsaturated Amidotitanocene Cations with Inverted σ and π Bond Strengths: Controlled Release of Aminyl Radicals and Hydrogenation/Dehydrogenation Catalysis. Chemistry 2021; 27:18175-18187. [PMID: 34669988 DOI: 10.1002/chem.202103487] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Indexed: 11/05/2022]
Abstract
Cationic amidotitanocene complexes [Cp2 Ti(NPhAr)][B(C6 F5 )4 ] (Cp=η5 -C5 H5 ; Ar=phenyl (1 a), p-tolyl (1 b), p-anisyl (1 c)) were isolated. The bonding situation was studied by DFT (Density Functional Theory) using EDA-NOCV (Energy Decomposition Analysis with Natural Orbitals for Chemical Valence). The polar Ti-N bond in 1 a-c features an unusual inversion of σ and π bond strengths responsible for the balance between stability and reactivity in these coordinatively unsaturated species. In solution, 1 a-c undergo photolytic Ti-N cleavage to release Ti(III) species and aminyl radicals ⋅NPhAr. Reaction of 1 b with H3 BNHMe2 results in fast homolytic Ti-N cleavage to give [Cp2 Ti(H3 BNHMe2 )][B(C6 F5 )4 ] (3). 1 a-c are highly active precatalysts in olefin hydrogenation and silanes/amines cross-dehydrogenative coupling, whilst 3 efficiently catalyzes amine-borane dehydrogenation. The mechanism of olefin hydrogenation was studied by DFT and the cooperative H2 activation key step was disclosed using the Activation Strain Model (ASM).
Collapse
Affiliation(s)
- Quentin Bonnin
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| | - Tereza Edlová
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| | - E Daiann Sosa Carrizo
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| | - Paul Fleurat-Lessard
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| | - Stéphane Brandès
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| | - Hélène Cattey
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| | - Philippe Richard
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| | - Pierre Le Gendre
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| | - Adrien T Normand
- Institut de Chimie Moléculaire de L'Université de Bourgogne (ICMUB), Université de Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France
| |
Collapse
|
46
|
Plajer AJ, Williams CK. Heterotrinuclear Ring Opening Copolymerization Catalysis: Structure–activity Relationships. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04449] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Alex J. Plajer
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Charlotte K. Williams
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| |
Collapse
|
47
|
Novák M, Turek J, Milasheuskaya Y, Růžičková Z, Podzimek Š, Jambor R. N-Donor stabilized tin(II) cations as efficient ROP catalysts for the synthesis of linear and star-shaped PLAs via the activated monomer mechanism. Dalton Trans 2021; 50:16039-16052. [PMID: 34651625 DOI: 10.1039/d1dt02658e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
α-Iminopyridine ligands L1 (2-(CHN(C6H2-2,4,6-Ph3))C5H4N), L2 (2-(CHN(C6H2-2,4,6-tBu3))C5H4N) and L3 (1,2-(C5H4N-2-CHN)2CH2CH2) differing by the steric demand of the substituent on the imine CHN group and by the number of donating nitrogen atoms were utilized to initiate a Lewis base mediated ionization of SnCl2 in an effort to prepare ionic tin(II) species [L1-3 → SnCl][SnCl3]. The reaction of L1 and L2 with SnCl2 led to the formation of neutral adducts [L1 → SnCl2] (2) and [L2 → SnCl2] (3). The preparation of the desired ionic compounds was achieved by subsequent reactions of 2 and 3 with an equivalent of SnCl2 or GaCl3. In contrast, ligand L3 containing four donor nitrogen atoms showed the ability to ionize SnCl2 and also Sn(OTf)2, yielding [L3 → SnCl][SnCl3] (7) and [L3 → Sn(H2O)][OTf]2 (8). The study thus revealed that the reaction is dependent on the type of the ligand. The prepared complexes 4-8 together with the previously reported [{2-((CH3)CN(C6H3-2,6-iPr2))-6-CH3O-C5H3N}SnCl][SnCl3] (1) were tested as catalysts for the ROP of L-lactide, which could operate via an activated monomer mechanism. Finally, a DFT computational study was performed to evaluate the steric and electronic properties of the ionic tin(II) species 1 and 4-8 together with their ability to interact with the L-lactide monomer.
Collapse
Affiliation(s)
- Miroslav Novák
- Institute of Chemistry and Technology of Macromolecular Materials, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 53210 Pardubice, Czech Republic.
| | - Jan Turek
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.
| | - Yaraslava Milasheuskaya
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 53210 Pardubice, Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 53210 Pardubice, Czech Republic
| | - Štěpán Podzimek
- Institute of Chemistry and Technology of Macromolecular Materials, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 53210 Pardubice, Czech Republic. .,Synpo, Ltd., S.K. Neumanna 1316, 53207 Pardubice, Czech Republic
| | - Roman Jambor
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 53210 Pardubice, Czech Republic
| |
Collapse
|
48
|
Shukla G, Ferrier RC. The versatile, functional polyether, polyepichlorohydrin: History, synthesis, and applications. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210514] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Geetanjali Shukla
- Department of Chemical Engineering and Materials Science Michigan State University East Lansing Michigan USA
| | - Robert C. Ferrier
- Department of Chemical Engineering and Materials Science Michigan State University East Lansing Michigan USA
| |
Collapse
|
49
|
Ghosh S, Glöckler E, Wölper C, Tjaberings A, Gröschel AH, Schulz S. Synthesis and Catalytic Activity of Gallium Schiff‐base Complexes in the Ring‐Opening Homo‐ and Copolymerization of Cyclic Esters. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Swarup Ghosh
- Faculty of Chemistry University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) Universitätsstr. 7 S07 S03 C30 D-45141 Essen
| | - Eduard Glöckler
- Faculty of Chemistry University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) Universitätsstr. 7 S07 S03 C30 D-45141 Essen
| | - Christoph Wölper
- Faculty of Chemistry University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) Universitätsstr. 7 S07 S03 C30 D-45141 Essen
| | - Alexander Tjaberings
- Faculty of Chemistry University of Münster and Center for Soft Nanoscience (SoN) Busso-Peus-Strasse 10 48149 Münster Germany
| | - André H. Gröschel
- Faculty of Chemistry University of Münster and Center for Soft Nanoscience (SoN) Busso-Peus-Strasse 10 48149 Münster Germany
| | - Stephan Schulz
- Faculty of Chemistry University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) Universitätsstr. 7 S07 S03 C30 D-45141 Essen
| |
Collapse
|
50
|
Inoue M, Kanazawa A, Aoshima S. Living Cationic Ring-Opening Homo- and Copolymerization of Cyclohexene Oxide by “Dormant” Species Generation Using Cyclic Ethers as Lewis Basic Additives. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00654] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masamichi Inoue
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Arihiro Kanazawa
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Sadahito Aoshima
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| |
Collapse
|