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Tufano F, Napolitano C, Mazzeo M, Grisi F, Lamberti M. CO 2-Based Polycarbonates through Ring-Opening Polymerization of Cyclic Carbonates Promoted by a NHC-Based Zinc Complex. Biomacromolecules 2024. [PMID: 38916862 DOI: 10.1021/acs.biomac.4c00532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
A backbone-substituted N-heterocyclic carbene (NHC) zinc complex, in combination with alcohol initiators, has been shown to be an effective catalyst for the ring-opening polymerization (ROP) of trimethylene carbonate (TMC) to poly(trimethylene carbonate) (PTMC) devoid of oxetane linkages. The ROP of TMC proceeded in solution to give PTMC, possessing controlled molecular mass (2500 < Mn < 10000) and low dispersity (Đ ∼ 1.2). Changing the alcohol initiators, PTMCs with different end-groups were obtained, included a telechelic polymer. The results of MALDI-ToF and NMR analysis confirmed the controlled/living nature of the present ROP catalytic system, where side reactions, such as inter- and intramolecular transesterifications, were minimized during the polymerization. Solution studies in different solvents demonstrated the polymerization reaction to proceed via a mechanism first order in monomer and in catalyst. The zinc complex was also able to convert substituted cyclic carbonates, which were purposely synthesized from renewable feedstocks such as CO2 and 1,3-diols. For the asymmetric 2-Me TMC monomer, good regioselectivity was observed (Xreg up to 0.92). The excellent control of the polymerization process was finally brought to light through the preparation of polycarbonate/polyether triblock copolymers by using polyethylene glycol (PEG) as a macroinitiator and of well-defined di- and triblock polycarbonate/polylactide copolymers by sequential ROP of TMC and L-LA.
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Affiliation(s)
- Federica Tufano
- Department of Chemistry and Biology "Adolfo Zambelli" University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
- Interuniversity Consortium Chemical Reactivity and Catalysis (CIRCC), Via Celso Ulpiani 27, 70126 Bari, BA, Italy
| | - Claudia Napolitano
- Department of Chemistry and Biology "Adolfo Zambelli" University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
- Interuniversity Consortium Chemical Reactivity and Catalysis (CIRCC), Via Celso Ulpiani 27, 70126 Bari, BA, Italy
| | - Mina Mazzeo
- Department of Chemistry and Biology "Adolfo Zambelli" University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
- Interuniversity Consortium Chemical Reactivity and Catalysis (CIRCC), Via Celso Ulpiani 27, 70126 Bari, BA, Italy
| | - Fabia Grisi
- Department of Chemistry and Biology "Adolfo Zambelli" University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
- Interuniversity Consortium Chemical Reactivity and Catalysis (CIRCC), Via Celso Ulpiani 27, 70126 Bari, BA, Italy
| | - Marina Lamberti
- Department of Chemistry and Biology "Adolfo Zambelli" University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
- Interuniversity Consortium Chemical Reactivity and Catalysis (CIRCC), Via Celso Ulpiani 27, 70126 Bari, BA, Italy
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Goswami S, Mandal P, Sarkar S, Mukherjee M, Pal S, Mallick D, Mukherjee D. Flexible NHC-aryloxido aluminum complex and its zwitterionic imidazolium aluminate precursor in ring-opening polymerization of ε-caprolactone. Dalton Trans 2024; 53:1346-1354. [PMID: 38164613 DOI: 10.1039/d3dt02932h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Anionic donor-functionalized NHC (N-heterocyclic carbene) complexes of Al are rare. We report one such case here, an NHC-aryloxido AlMe2 complex [Al(L)Me2] (2), following a stepwise synthesis from the proligand [HO-4,6-tBu2-C6H2-2-CH2{CH(NCHCHNAr)}]Br [LH2Br; Ar = 2,6-iPr2-C6H3 (Dipp)] and AlMe3via the zwitterionic intermediate [Al(LH)Me2Br] (1). The ligand's flexibility in 2 is evident from the conformational fluxionality revealed by VT-1H NMR spectroscopic analysis. The ∠O-Al-C (ca. 100.5°) bite angle is also wider than the ∠O-Ti-C (ca. 80.6°) as seen in our recently reported Ti complex [Ti(L)(NMe2)2Br]. DFT analysis showed that the CNHC-Al bond is significantly ionic, as is the CNHC-Ti bond. Both 1 and 2 are active in the ring-opening polymerization (ROP) of ε-caprolactone (CL). 2, similar to [Ti(L)(NMe2)2Br], exhibits bifunctional MLC-type monomer activation, but only at an elevated temperature. However, the 2/BnOH combination is catalytically active at room temperature, likely through a zwitterionic [Al(LH)Me2(OBn)]. The 1/BnOH combination follows a similar mechanism but surprisingly at a faster rate.
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Affiliation(s)
- Santu Goswami
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, West Bengal, India.
| | - Pranay Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, West Bengal, India.
| | - Subham Sarkar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, West Bengal, India.
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, 700073, West Bengal, India.
| | - Mainak Mukherjee
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar, Rajasthan 342037, India.
| | - Samanwita Pal
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar, Rajasthan 342037, India.
| | - Dibyendu Mallick
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, 700073, West Bengal, India.
| | - Debabrata Mukherjee
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, West Bengal, India.
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Recent progress of catalysts for synthesis of cyclic carbonates from CO2 and epoxides. J CO2 UTIL 2023. [DOI: 10.1016/j.jcou.2022.102355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Ring opening polymerization of lactide promoted by Zinc and Magnesium complexes with a N-heterocyclic carbene-phenoxy-imine hybrid non-innocent ligand. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Rodríguez-Álvarez A, González-Espinoza CE, Martínez-De-León CG, Carrillo-Tripp M, Hô M, Grévy JM. Experimental and theoretical insights into the trans influence of organo-sulfur and -selenium ligands in 5,6-membered palladium( ii) cationic pincer complexes based on iminophosphoranes. NEW J CHEM 2022. [DOI: 10.1039/d2nj00924b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The trans influence of organochalcogen ancillary ligands was assessed by experimental and DFT studies in 5,6-membered SNS and SNSe Pd(ii) pincers.
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Affiliation(s)
- Aurora Rodríguez-Álvarez
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad # 1001, Chamilpa, CP 62209 Cuernavaca, Morelos, Mexico
| | | | - Carla Gabriela Martínez-De-León
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad # 1001, Chamilpa, CP 62209 Cuernavaca, Morelos, Mexico
| | - Mauricio Carrillo-Tripp
- Biomolecular Diversity Laboratory, Centro de investigación y de Estudios Avanzados Unidad Monterrey, Vía del Conocimiento 201, PIIT, C.P. 66600 Apodaca, Nuevo León, Mexico
| | - Minhhuy Hô
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad # 1001, Chamilpa, CP 62209 Cuernavaca, Morelos, Mexico
| | - Jean-Michel Grévy
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad # 1001, Chamilpa, CP 62209 Cuernavaca, Morelos, Mexico
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Bawari D, Volodarsky S, Ginzburg Y, Jaiswal K, Joshi P, Dobrovetsky R. Phosphorus mediated imidazolinium to oxazolium ring rearrangement. Dalton Trans 2021; 50:16478-16482. [PMID: 34730572 DOI: 10.1039/d1dt03363h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
An unexpected rearrangement occurred when an imidazolinium based OCO pincer-type ligand (1) reacted with PCl3 producing a chlorophosphine with a pendant oxazolium "arm" (3). The mechanism of this rearrangement was studied both experimentally and by density functional theory (DFT) computations. The deprotonation of 3 led to further unexpected results.
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Affiliation(s)
- Deependra Bawari
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Solomon Volodarsky
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Yael Ginzburg
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Kuldeep Jaiswal
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Pooja Joshi
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Roman Dobrovetsky
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
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Diniz Lessa M, Fajardo JRD, Delarmelina M, Carneiro JWDM. A DFT study on the mechanism for polymerization of δ-valerolactone initiated by N-heterocyclic carbene (NHC) catalysts. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Dąbrowska AM, Hurko A, Durka K, Dranka M, Horeglad P. The Effect of Symmetric and Asymmetric NHCs on the Structure and Catalytic Properties of Dialkylgallium Alkoxides in the Ring-Opening Polymerization of rac-Lactide—Linking the Structure, Activity, and Stereoselectivity. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anna Maria Dąbrowska
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Aleksander Hurko
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Krzysztof Durka
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Maciej Dranka
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Paweł Horeglad
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
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