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Wannipurage D, D'Aniello S, Pappalardo D, Kulathungage LW, Ward CL, Anderson DP, Groysman S, Mazzeo M. Simple magnesium alkoxides: synthesis, molecular structure, and catalytic behaviour in the ring-opening polymerization of lactide and macrolactones and in the copolymerization of maleic anhydride and propylene oxide. Dalton Trans 2023; 52:8077-8091. [PMID: 37232395 PMCID: PMC11066581 DOI: 10.1039/d3dt00785e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The synthesis of two chiral bulky alkoxide pro-ligands, 1-adamantyl-tert-butylphenylmethanol HOCAdtBuPh and 1-adamantylmethylphenylmethanol HOCAdMePh, is reported and their coordination chemistry with magnesium(II) is described and compared with the coordination chemistry of the previously reported achiral bulky alkoxide pro-ligand HOCtBu2Ph. Treatment of n-butyl-sec-butylmagnesium with two equivalents of the racemic mixture of HOCAdtBuPh led selectively to the formation of the mononuclear bis(alkoxide) complex Mg(OCAdtBuPh)2(THF)2. 1H NMR spectroscopy and X-ray crystallography suggested the selective formation of the C2-symmetric homochiral diastereomer Mg(OCRAdtBuPh)2(THF)2/Mg(OCSAdtBuPh)2(THF)2. In contrast, the less sterically encumbered HOCAdMePh led to the formation of dinuclear products indicating only partial alkyl group substitution. The mononuclear Mg(OCAdtBuPh)2(THF)2 complex was tested as a catalyst in different reactions for the synthesis of polyesters. In the ROP of lactide, Mg(OCAdtBuPh)2(THF)2 demonstrated very high activity, higher than that shown by Mg(OCtBu2Ph)2(THF)2, although with moderate control degrees. Both Mg(OCAdtBuPh)2(THF)2 and Mg(OCtBu2Ph)2(THF)2 were found to be very effective in the polymerization of macrolactones such as ω-pentadecalactone (PDL) and ω-6-hexadecenlactone (HDL) also under mild reaction conditions that are generally prohibitive for these substrates. The same catalysts demonstrated efficient ring-opening copolymerization (ROCOP) of propylene oxide (PO) and maleic anhydride (MA) to produce poly(propylene maleate).
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Affiliation(s)
- Duleeka Wannipurage
- Department of Chemistry, Wayne State University, 5101 Cass Ave., Detroit, MI 48202, USA.
| | - Sara D'Aniello
- Department of Chemistry and Biology "A. Zambelli" University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.
| | - Daniela Pappalardo
- Dipartimento di Scienze e Tecnologie, Università del Sannio, via de Sanctis snc, 82100 Benevento, Italy
| | | | - Cassandra L Ward
- Lumigen Instrument Center, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, USA
| | - Dennis P Anderson
- Lumigen Instrument Center, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, USA
| | - Stanislav Groysman
- Department of Chemistry, Wayne State University, 5101 Cass Ave., Detroit, MI 48202, USA.
| | - Mina Mazzeo
- Department of Chemistry and Biology "A. Zambelli" University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.
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Aryloxy ‘biometal’ complexes as efficient catalysts for the synthesis of poly(butylene adipate terephthalate). MENDELEEV COMMUNICATIONS 2022. [DOI: 10.1016/j.mencom.2022.05.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Clamor C, Cattoz BN, Wright PM, O'Reilly RK, Dove AP. Controlling the crystallinity and solubility of functional PCL with efficient post-polymerisation modification. Polym Chem 2021. [DOI: 10.1039/d0py01535k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Varying the size of an alkyl side-chain group, installed by thiol–ene addition of alkylthiols to poly(ε-allyl caprolactone), the semi-crystallinity and lipophilicity of functional PCLs could be modulated to achieve divergent physico-chemical properties.
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Affiliation(s)
- Cinzia Clamor
- School of Chemistry
- University of Birmingham
- Birmingham B15 2TT
- UK
| | | | | | | | - Andrew P. Dove
- School of Chemistry
- University of Birmingham
- Birmingham B15 2TT
- UK
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Atta S, Cohen J, Kohn J, Gormley AJ. Ring opening polymerization of ε-caprolactone through water. Polym Chem 2021. [DOI: 10.1039/d0py01481h] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ring opening polymerization (ROP) through water is used to synthesize biodegradable polymers such as polycaprolactone (PCL).
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Affiliation(s)
- Supriya Atta
- Department of Biomedical Engineering Rutgers
- The State University of New Jersey
- Piscataway
- USA
| | - Jarrod Cohen
- Department of Chemistry and Chemical Biology Rutgers
- The State University of New Jersey
- Piscataway
- USA
| | - Joachim Kohn
- Department of Chemistry and Chemical Biology Rutgers
- The State University of New Jersey
- Piscataway
- USA
| | - Adam J. Gormley
- Department of Biomedical Engineering Rutgers
- The State University of New Jersey
- Piscataway
- USA
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Ng JQ, Arima H, Mochizuki T, Toh K, Matsui K, Ratanasak M, Hasegawa JY, Hatano M, Ishihara K. Chemoselective Transesterification of Methyl (Meth)acrylates Catalyzed by Sodium(I) or Magnesium(II) Aryloxides. ACS Catal 2020. [DOI: 10.1021/acscatal.0c04217] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jie Qi Ng
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Hiro Arima
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Takuya Mochizuki
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Kohei Toh
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Kai Matsui
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Manussada Ratanasak
- Section of Theoretical Catalytic Chemistry, Institute for Catalysis, Hokkaido University, N21W10, Kita-ku, Sapporo, Hokkaido 011-0021, Japan
| | - Jun-Ya Hasegawa
- Section of Theoretical Catalytic Chemistry, Institute for Catalysis, Hokkaido University, N21W10, Kita-ku, Sapporo, Hokkaido 011-0021, Japan
| | - Manabu Hatano
- Graduate School of Pharmaceutical Sciences, Kobe Pharmaceutical University, 4-19-1, Motoyamakitamachi, Higashinada, Kobe 658-8558, Japan
| | - Kazuaki Ishihara
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
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Nifant’ev I, Komarov P, Ovchinnikova V, Kiselev A, Minyaev M, Ivchenko P. Comparative Experimental and Theoretical Study of Mg, Al and Zn Aryloxy Complexes in Copolymerization of Cyclic Esters: The Role of the Metal Coordination in Formation of Random Copolymers. Polymers (Basel) 2020; 12:E2273. [PMID: 33023256 PMCID: PMC7600584 DOI: 10.3390/polym12102273] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 11/16/2022] Open
Abstract
Homogeneity of copolymers is a general problem of catalytic coordination polymerization. In ring-opening polymerization of cyclic esters, the rational design of the catalyst is generally applied to solve this problem by the equalization of the reactivities of comonomers-however, it often leads to a reduction of catalytic activity. In the present paper, we studied the catalytic behavior of BnOH-activated complexes (ВНТ)Mg(THF)2nBu (1), (ВНТ)2AlMe (2) and [(ВНТ)ZnEt]2 (3), based on 2,6-di-tert-butyl-4-methylphenol (BHT-H) in homo- and copolymerization of L-lactide (lLA) and ε-caprolactone (εCL). Even at 1:5 lLA/εCL ratio Mg complex 1 catalyzed homopolymerization of lLA without involving εCL to the formation of the polymer backbone. On the contrary, Zn complex 3 efficiently catalyzed random lLA/εCL copolymerization; the presence of mono-lactate subunits in the copolymer chain clearly pointed to the transesterification mechanism of copolymer formation. Both epimerization and transesterification side processes were analyzed using the density functional theory (DFT) modeling that confirmed the qualitative difference in catalytic behavior of 1 and 3: Mg and Zn complexes demonstrated different types of preferable coordination on the PLA chain (k2 and k3, respectively) with the result that complex 3 catalyzed controlled εCL ROP/PLA transesterification, providing the formation of lLA/εCL copolymers that contain mono-lactate fragments separated by short oligo(εCL) chains. The best results in the synthesis of random lLA/εCL copolymers were obtained during experiments on transesterification of commercially available PLLA, the applicability of 3/BnOH catalyst in the synthesis of random copolymers of εCL with methyl glycolide, ethyl ethylene phosphonate and ethyl ethylene phosphate was also demonstrated.
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Affiliation(s)
- Ilya Nifant’ev
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1–3, 119991 Moscow, Russia
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninsky Avenue 29, 119991 Moscow, Russia; (P.K.); (V.O.); (A.K.); (M.M.)
- Faculty of Chemistry, National Research University Higher School of Economics, Miasnitskaya Str. 20, 101000 Moscow, Russia
| | - Pavel Komarov
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninsky Avenue 29, 119991 Moscow, Russia; (P.K.); (V.O.); (A.K.); (M.M.)
| | - Valeriya Ovchinnikova
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninsky Avenue 29, 119991 Moscow, Russia; (P.K.); (V.O.); (A.K.); (M.M.)
| | - Artem Kiselev
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninsky Avenue 29, 119991 Moscow, Russia; (P.K.); (V.O.); (A.K.); (M.M.)
- Faculty of Chemistry, National Research University Higher School of Economics, Miasnitskaya Str. 20, 101000 Moscow, Russia
| | - Mikhail Minyaev
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninsky Avenue 29, 119991 Moscow, Russia; (P.K.); (V.O.); (A.K.); (M.M.)
- N.D. Zelinsky Institute of Organic Chemistry RAS, Leninsky pr. 47, 119991 Moscow, Russia
| | - Pavel Ivchenko
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1–3, 119991 Moscow, Russia
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninsky Avenue 29, 119991 Moscow, Russia; (P.K.); (V.O.); (A.K.); (M.M.)
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Wannipurage D, Hollingsworth TS, Santulli F, Cozzolino M, Lamberti M, Groysman S, Mazzeo M. Synthesis of a mononuclear magnesium bis(alkoxide) complex and its reactivity in the ring-opening copolymerization of cyclic anhydrides with epoxides. Dalton Trans 2020; 49:2715-2723. [PMID: 32051999 DOI: 10.1039/c9dt04274a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of a new mononuclear magnesium complex with a bulky bis(alkoxide) ligand environment and its reactivity in ring-opening polymerization (ROP) and ring-opening copolymerization (ROCOP) are reported. Reaction of n-butyl-sec-butylmagnesium with two equivalents of HOR (HOR = di-tert-butylphenylmethanol, HOCtBu2Ph) formed Mg(OR)2(THF)2. The reaction proceeded via the Mg(OR)(sec-Bu)(THF)2 intermediate that was independently synthesized by treating n-butyl-sec-butylmagnesium with one equivalent of HOR. Mg(OR)2(THF)2 led to active albeit not well-controlled ROP of rac-lactide. In contrast, well-controlled ROCOP of epoxides with cyclic anhydrides was observed, including efficient and alternating copolymerization of phthalic anhydride with cyclohexene oxide as well as rare copolymerization of phthalic anhydride with limonene oxide and terpolymerization of phthalic anhydride with both cyclohexene oxide and limonene oxide. In addition, novel copolymerization of dihydrocoumarin with limonene oxide is described.
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Affiliation(s)
- Duleeka Wannipurage
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202, USA.
| | | | - Federica Santulli
- Department of Chemistry and Biology "A. Zambelli" University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.
| | - Mariachiara Cozzolino
- Department of Chemistry and Biology "A. Zambelli" University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.
| | - Marina Lamberti
- Department of Chemistry and Biology "A. Zambelli" University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.
| | - Stanislav Groysman
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202, USA.
| | - Mina Mazzeo
- Department of Chemistry and Biology "A. Zambelli" University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.
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Nifant’ev I, Ivchenko P. Coordination Ring-Opening Polymerization of Cyclic Esters: A Critical Overview of DFT Modeling and Visualization of the Reaction Mechanisms. Molecules 2019; 24:E4117. [PMID: 31739538 PMCID: PMC6891794 DOI: 10.3390/molecules24224117] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 11/09/2019] [Accepted: 11/12/2019] [Indexed: 01/29/2023] Open
Abstract
Ring-opening polymerization (ROP) of cyclic esters (lactones, lactides, cyclic carbonates and phosphates) is an effective tool to synthesize biocompatible and biodegradable polymers. Metal complexes effectively catalyze ROP, a remarkable diversity of the ROP mechanisms prompted the use of density functional theory (DFT) methods for simulation and visualization of the ROP pathways. Optimization of the molecular structures of the key reaction intermediates and transition states has allowed to explain the values of catalytic activities and stereocontrol events. DFT computation data sets might be viewed as a sound basis for the design of novel ROP catalysts and cyclic substrates, for the creation of new types of homo- and copolymers with promising properties. In this review, we summarized the results of DFT modeling of coordination ROP of cyclic esters. The importance to understand the difference between initiation and propagation stages, to consider the possibility of polymer-catalyst coordination, to figure out the key transition states, and other aspects of DFT simulation and visualization of ROP have been also discussed in our review.
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Affiliation(s)
- Ilya Nifant’ev
- Chemistry Department, M.V. Lomonosov Moscow State University, 1 Leninskie Gory Str., Building 3, 119991 Moscow, Russia
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, 29 Leninsky Pr., 119991 Moscow, Russia
| | - Pavel Ivchenko
- Chemistry Department, M.V. Lomonosov Moscow State University, 1 Leninskie Gory Str., Building 3, 119991 Moscow, Russia
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, 29 Leninsky Pr., 119991 Moscow, Russia
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Nifant'ev I, Shlyakhtin A, Kosarev M, Gavrilov D, Karchevsky S, Ivchenko P. DFT Visualization and Experimental Evidence of BHT-Mg-Catalyzed Copolymerization of Lactides, Lactones and Ethylene Phosphates. Polymers (Basel) 2019; 11:E1641. [PMID: 31658688 PMCID: PMC6836241 DOI: 10.3390/polym11101641] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 10/05/2019] [Accepted: 10/08/2019] [Indexed: 12/02/2022] Open
Abstract
Catalytic ring-opening polymerization (ROP) of cyclic esters (lactides, lactones) and cyclic ethylene phosphates is an effective way to process materials with regulated hydrophilicity and controlled biodegradability. Random copolymers of cyclic monomers of different chemical nature are highly attractive due to their high variability of characteristics. Aryloxy-alkoxy complexes of non-toxic metals such as derivatives of 2,6-di-tert-butyl-4-methylphenoxy magnesium (BHT-Mg) complexes are effective coordination catalysts for homopolymerization of all types of traditional ROP monomers. In the present paper, we report the results of density functional theory (DFT) modeling of BHT-Mg-catalyzed copolymerization for lactone/lactide, lactone/ethylene phosphate and lactide/ethylene phosphate mixtures. ε-Caprolactone (ε-CL), l-lactide (l-LA) and methyl ethylene phosphate (MeOEP) were used as examples of monomers in DFT simulations by the Gaussian-09 program package with the B3PW91/DGTZVP basis set. Both binuclear and mononuclear reaction mechanistic concepts have been applied for the calculations of the reaction profiles. The results of calculations predict the possibility of the formation of random copolymers based on l-LA/MeOEP, and substantial hindrance of copolymerization for ε-CL/l-LA and ε-CL/MeOEP pairs. From the mechanistic point of view, the formation of highly stable five-membered chelate by the products of l-LA ring-opening and high donor properties of phosphates are the key factors that rule the reactions. The results of DFT modeling have been confirmed by copolymerization experiments.
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Affiliation(s)
- Ilya Nifant'ev
- Chemistry Department, M.V. Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991 Moscow, Russia.
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, 29 Leninsky Pr., 119991 Moscow, Russia.
| | - Andrey Shlyakhtin
- Chemistry Department, M.V. Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991 Moscow, Russia.
| | - Maxim Kosarev
- Chemistry Department, M.V. Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991 Moscow, Russia.
| | - Dmitry Gavrilov
- Chemistry Department, M.V. Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991 Moscow, Russia.
| | - Stanislav Karchevsky
- Joint-stock company "Institute of petroleum refining and petrochemistry", 12 Iniciativnaya Str., 450065 Ufa, Republic of Bashkortostan, Russia.
| | - Pavel Ivchenko
- Chemistry Department, M.V. Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991 Moscow, Russia.
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, 29 Leninsky Pr., 119991 Moscow, Russia.
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Immortal Ring Opening Polymerization of ε-caprolactone and rac-lactide by magnesium precatalysts bearing sterically congested phenoxide ligands. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.06.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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11
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Cai Z, Wan Y, Becker ML, Long YZ, Dean D. Poly(propylene fumarate)-based materials: Synthesis, functionalization, properties, device fabrication and biomedical applications. Biomaterials 2019; 208:45-71. [PMID: 30991217 DOI: 10.1016/j.biomaterials.2019.03.038] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 03/04/2019] [Accepted: 03/23/2019] [Indexed: 12/22/2022]
Abstract
Poly(propylene fumarate) (PPF) is a biodegradable polymer that has been investigated extensively over the last three decades. It has led many scientists to synthesize and fabricate a variety of PPF-based materials for biomedical applications due to its controllable mechanical properties, tunable degradation and biocompatibility. This review provides a comprehensive overview of the progress made in improving PPF synthesis, resin formulation, crosslinking, device fabrication and post polymerization modification. Further, we highlight the influence of these parameters on biodegradation, biocompatibility, and their use in a number of regenerative medicine applications, especially bone tissue engineering. In particular, the use of 3D printing techniques for the fabrication of PPF-based scaffolds is extensively reviewed. The recent invention of a ring-opening polymerization method affords precise control of PPF molecular mass, molecular mass distribution (ƉM) and viscosity. Low ƉM facilitates time-certain resorption of 3D printed structures. Novel post-polymerization and post-printing functionalization methods have accelerated the expansion of biomedical applications that utilize PPF-based materials. Finally, we shed light on evolving uses of PPF-based materials for orthopedics/bone tissue engineering and other biomedical applications, including its use as a hydrogel for bioprinting.
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Affiliation(s)
- Zhongyu Cai
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585, Singapore; Department of Chemistry, University of Pittsburgh, Chevron Science Center, 219 Parkman Avenue, Pittsburgh, PA 15260, United States.
| | - Yong Wan
- Collaborative Innovation Center for Nanomaterials, College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao, 266071, Shandong Province, China
| | - Matthew L Becker
- Department of Polymer Science, The University of Akron, Akron, OH 44325, United States
| | - Yun-Ze Long
- Collaborative Innovation Center for Nanomaterials, College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao, 266071, Shandong Province, China; Industrial Research Institute of Nonwovens & Technical Textiles, Qingdao University, No. 308 Ningxia Road, Qingdao, 266071, Shandong Province, China.
| | - David Dean
- Department of Plastic & Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States.
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Nifant'ev IE, Shlyakhtin AV, Bagrov VV, Komarov PD, Tavtorkin AN, Minyaev ME, Kosarev MA, Ivchenko PV. Synthesis in aqueous media of poly(ethylene phosphoric acids) by mild thermolysis of homopolymers and block copolymers based on tert-butyl ethylene phosphate. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.07.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Minyaev ME, Nifant'ev IE, Shlyakhtin AV, Ivchenko PV, Lyssenko KA. Phenoxide and alkoxide complexes of Mg, Al and Zn, and their use for the ring-opening polymerization of ℇ-caprolactone with initiators of different natures. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2018; 74:548-557. [PMID: 29726463 DOI: 10.1107/s2053229618005090] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 03/29/2018] [Indexed: 12/30/2022]
Abstract
A new packing polymorph of bis(2,6-di-tert-butyl-4-methylphenolato-κO)bis(tetrahydrofuran-κO)magnesium, [Mg(C15H23O)2(C4H8O)2] or Mg(BHT)2(THF)2, (BHT is the 2,6-di-tert-butyl-4-methylphenoxide anion and THF is tetrahydrofuran), (1), has the same space group (P21) as the previously reported modification [Nifant'ev et al. (2017d). Dalton Trans. 46, 12132-12146], but contains three crystallographically independent molecules instead of one. The structure of (1) exhibits rotational disorder of the tert-butyl groups and positional disorder of a THF ligand. The complex of bis(2,6-di-tert-butyl-4-methylphenolato-κO)bis(μ2-ethyl glycolato-κ2O,O':κO)dimethyldialuminium, [Al2(CH3)2(C4H7O3)2(C15H23O)2] or [(BHT)AlMe(OCH2COOEt)]2, (2), is a dimer located on an inversion centre and has an Al2O2 rhomboid core. The 2-ethoxy-2-oxoethanolate ligand (OCH2COOEt) displays a μ2-κ2O,O':κO semi-bridging coordination mode, forming a five-membered heteronuclear Al-O-C-C-O ring. The same ligand exhibits positional disorder of the terminal methyl group. The redetermined structure of the heptanuclear complex octakis(μ3-benzyloxo-κO:κO:κO)hexaethylheptazinc, [Zn7(C2H5)6(C7H7O)8] or [Zn7(OCH2Ph)8Et6], (3), possesses a bicubic Zn7O8 core located at an inversion centre and demonstrates positional disorder of one crystallographically independent phenyl group. Cambridge Structural Database surveys are given for complexes structurally analogous to (2) and (3). Complexes (2) and (3), as well as derivatives of (1), are of interest as catalysts for the ring-opening polymerization of ℇ-caprolactone, and polymerization results are reported.
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Affiliation(s)
- Mikhail E Minyaev
- A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prospect, Moscow 119991, Russian Federation
| | - Ilya E Nifant'ev
- A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prospect, Moscow 119991, Russian Federation
| | - Andrey V Shlyakhtin
- A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prospect, Moscow 119991, Russian Federation
| | - Pavel V Ivchenko
- A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prospect, Moscow 119991, Russian Federation
| | - Konstantin A Lyssenko
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova Str., Moscow 119991, Russian Federation
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Messiha HL, Ahmed ST, Karuppiah V, Suardíaz R, Ascue Avalos GA, Fey N, Yeates S, Toogood HS, Mulholland AJ, Scrutton NS. Biocatalytic Routes to Lactone Monomers for Polymer Production. Biochemistry 2018; 57:1997-2008. [PMID: 29533655 DOI: 10.1021/acs.biochem.8b00169] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Monoterpenoids offer potential as biocatalytically derived monomer feedstocks for high-performance renewable polymers. We describe a biocatalytic route to lactone monomers menthide and dihydrocarvide employing Baeyer-Villiger monooxygenases (BVMOs) from Pseudomonas sp. HI-70 (CPDMO) and Rhodococcus sp. Phi1 (CHMOPhi1) as an alternative to organic synthesis. The regioselectivity of dihydrocarvide isomer formation was controlled by site-directed mutagenesis of three key active site residues in CHMOPhi1. A combination of crystal structure determination, molecular dynamics simulations, and mechanistic modeling using density functional theory on a range of models provides insight into the origins of the discrimination of the wild type and a variant CHMOPhi1 for producing different regioisomers of the lactone product. Ring-opening polymerizations of the resultant lactones using mild metal-organic catalysts demonstrate their utility in polymer production. This semisynthetic approach utilizing a biocatalytic step, non-petroleum feedstocks, and mild polymerization catalysts allows access to known and also to previously unreported and potentially novel lactone monomers and polymers.
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Affiliation(s)
| | | | | | - Reynier Suardíaz
- Centre for Computational Chemistry, School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | | | - Natalie Fey
- Centre for Computational Chemistry, School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | | | | | - Adrian J Mulholland
- Centre for Computational Chemistry, School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
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15
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Wilson JA, Luong D, Kleinfehn AP, Sallam S, Wesdemiotis C, Becker ML. Magnesium Catalyzed Polymerization of End Functionalized Poly(propylene maleate) and Poly(propylene fumarate) for 3D Printing of Bioactive Scaffolds. J Am Chem Soc 2017; 140:277-284. [DOI: 10.1021/jacs.7b09978] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- James A. Wilson
- Department
of Polymer Science, University of Akron, Akron, Ohio 44325, United States
| | - Derek Luong
- Department
of Polymer Science, University of Akron, Akron, Ohio 44325, United States
| | - Alex P. Kleinfehn
- Department
of Polymer Science, University of Akron, Akron, Ohio 44325, United States
| | - Sahar Sallam
- Department
of Chemistry, University of Akron, Akron, Ohio 44325, United States
| | - Chrys Wesdemiotis
- Department
of Chemistry, University of Akron, Akron, Ohio 44325, United States
| | - Matthew L. Becker
- Department
of Polymer Science, University of Akron, Akron, Ohio 44325, United States
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16
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Tschan MJ, Ieong NS, Todd R, Everson J, Dove AP. Unlocking the Potential of Poly(Ortho Ester)s: A General Catalytic Approach to the Synthesis of Surface-Erodible Materials. Angew Chem Int Ed Engl 2017; 56:16664-16668. [PMID: 29087610 PMCID: PMC5814846 DOI: 10.1002/anie.201709934] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 10/25/2017] [Indexed: 11/30/2022]
Abstract
Poly(ortho ester)s (POEs) are well-known for their surface-eroding properties and hence present unique opportunities for controlled-release and tissue-engineering applications. Their development and wide-spread investigation has, however, been severely limited by challenging synthetic requirements that incorporate unstable intermediates and are therefore highly irreproducible. Herein, the first catalytic method for the synthesis of POEs using air- and moisture-stable vinyl acetal precursors is presented. The synthesis of a range of POE structures is demonstrated, including those that are extremely difficult to achieve by other synthetic methods. Furthermore, application of this chemistry permits efficient installation of functional groups through ortho ester linkages on an aliphatic polycarbonate.
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Affiliation(s)
| | - Nga Sze Ieong
- Department of ChemistryThe University of WarwickCoventryCV4 7ALUK
| | - Richard Todd
- Department of ChemistryThe University of WarwickCoventryCV4 7ALUK
| | - Jack Everson
- Department of ChemistryThe University of WarwickCoventryCV4 7ALUK
| | - Andrew P. Dove
- Department of ChemistryThe University of WarwickCoventryCV4 7ALUK
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17
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Tschan MJL, Ieong NS, Todd R, Everson J, Dove AP. Unlocking the Potential of Poly(Ortho
Ester)s: A General Catalytic Approach to the Synthesis of Surface-Erodible Materials. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709934] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
| | - Nga Sze Ieong
- Department of Chemistry; The University of Warwick; Coventry CV4 7AL UK
| | - Richard Todd
- Department of Chemistry; The University of Warwick; Coventry CV4 7AL UK
| | - Jack Everson
- Department of Chemistry; The University of Warwick; Coventry CV4 7AL UK
| | - Andrew P. Dove
- Department of Chemistry; The University of Warwick; Coventry CV4 7AL UK
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18
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Minyaev ME, Churakov AV, Nifant'ev IE. Structural diversity of polynuclear Mg xO y cores in magnesium phenoxide complexes. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2017; 73:854-861. [PMID: 29111509 DOI: 10.1107/s2053229617012657] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2017] [Accepted: 09/03/2017] [Indexed: 11/11/2022]
Abstract
The binuclear complex bis(2,6-di-tert-butyl-4-methylphenolato)-1κO,2κO-(1,2-dimethoxyethane-1κ2O,O')bis(μ-phenylmethanolato-1:2κ2O:O)(tetrahydrofuran-2κO)dimagnesium(II), [Mg2(C7H7O)2(C15H23O)2(C4H8O)(C4H10O2)] or [(BHT)(DME)Mg(μ-OBn)2Mg(THF)(BHT)], (I), was obtained from the complex [(BHT)Mg(μ-OBn)(THF)]2 by substitution of one tetrahydrofuran (THF) molecule with 1,2-dimethoxyethane (DME) in toluene (BHT is O-2,6-tBu2-4-MeC6H4 and Bn is benzyl). The trinuclear complex bis(2,6-di-tert-butyl-4-methylphenolato)-1κO,3κO-tetrakis(μ-2-methylphenolato)-1:2κ4O:O;2:3κ4O:O-bis(tetrahydrofuran)-1κO,3κO-trimagnesium(II), [Mg3(C7H7O)4(C15H23O)2(C4H8O)2] or [(BHT)2(μ-O-2-MeC6H4)4(THF)2Mg3], (II), was formed from a mixture of Bu2Mg, [(BHT)Mg(nBu)(THF)2] and 2-methylphenol. An unusual tetranuclear complex, bis(μ3-2-aminoethanolato-κ4O:O:O,N)tetrakis(μ2-2-aminoethanolato-κ3O:O,N)bis(2,6-di-tert-butyl-4-methylphenolato-κO)tetramagnesium(II), [Mg4(C2H6NO)6(C15H23O)2] or Mg4(BHT)2(OCH2CH2NH2)6, (III), resulted from the reaction between (BHT)2Mg(THF)2 and 2-aminoethanol. A polymerization test demonstrated the ability of (III) to catalyse the ring-opening polymerization of ℇ-caprolactone without activation by alcohol. In all three complexes (I)-(III), the BHT ligand demonstrates the terminal κO-coordination mode. Complexes (I), (II) and (III) have binuclear rhomboid Mg2O2, trinuclear chain-like Mg3O4 and bicubic Mg4O6 cores, respectively. A survey of the literature on known polynuclear MgxOy core types for ArO-Mg complexes is also presented.
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Affiliation(s)
- Mikhail E Minyaev
- A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prospect, Moscow 119991, Russian Federation
| | - Andrei V Churakov
- N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky Prospect, Moscow 119991, Russian Federation
| | - Ilya E Nifant'ev
- A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prospect, Moscow 119991, Russian Federation
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19
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Nifant'ev IE, Shlyakhtin AV, Bagrov VV, Minyaev ME, Churakov AV, Karchevsky SG, Birin KP, Ivchenko PV. Mono-BHT heteroleptic magnesium complexes: synthesis, molecular structure and catalytic behavior in the ring-opening polymerization of cyclic esters. Dalton Trans 2017; 46:12132-12146. [PMID: 28869269 DOI: 10.1039/c7dt02469j] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Numerous heteroleptic 2,6-di-tert-butyl-4-methylphenolate (BHT) magnesium complexes have been synthesized by treatment of (BHT)MgBu(THF)2 with various alcohols. Molecular structures of the complexes have been determined by X-ray diffraction. The magnesium coordination number in [(BHT)Mg(μ-OBn)(THF)]2 (3) and [(BHT)Mg(μ-O-tert-BuC6H4)(THF)]2 (4) is equal to 4. Complexes formed from esters of glycolic and lactic acids, [(BHT)Mg(μ-OCH2COOEt)(THF)]2 (5) and [(BHT)Mg(μ-OCH(CH3)COOCH2COOtBu)(THF)]2 (6) contain chelate fragments with pentacoordinated magnesium. Compounds 3-6 contain THF molecules coordinated to magnesium atoms. Complex {(BHT)Mg[μ-O(CH2)3CON(CH3)2]}2 (7) does not demonstrate any tendency to form an adduct with THF. It has been experimentally determined that complexes 3 and 5 are highly active catalysts of lactide polymerization. The activity of 4 is rather low, and complex 7 demonstrates moderate productivity. According to DOSY NMR experiments, compounds 3 and 5 retain their dimeric structures even in THF. The free energies of model dimeric [(DBP)Mg(μ-OMe)(Sub)]2 and monomeric (DBP)Mg(OMe)(Sub)2 products on treatment of [(DBP)Mg(μ-OMe)(THF)]2 with a series of σ-electron donors (Sub) have been estimated by DFT calculations. These results demonstrate that the substitution of THF by Sub in a dimeric molecule is an energetically allowed process, whereas the dissociation of dimers is energetically unfavorable. DFT modeling of ε-CL and (dl)-lactide ROP catalyzed by dimeric and monomeric complexes showed that a cooperative effect of two magnesium atoms occurs within the ROP for binuclear catalytic species. A comparison of the reaction profiles for ROP catalyzed by binuclear and mononuclear species allowed us to conclude that the binuclear mechanism is favorable in early stages of ROP initiated by dimers 3 and 5.
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Affiliation(s)
- I E Nifant'ev
- M.V. Lomonosov Moscow State University, Department of Chemistry, Moscow, Russian Federation. and A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, Russian Federation
| | - A V Shlyakhtin
- M.V. Lomonosov Moscow State University, Department of Chemistry, Moscow, Russian Federation.
| | - V V Bagrov
- M.V. Lomonosov Moscow State University, Department of Chemistry, Moscow, Russian Federation.
| | - M E Minyaev
- A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, Russian Federation
| | - A V Churakov
- N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky Prospect, 119991, Moscow, Russian Federation
| | - S G Karchevsky
- Institute of Petroleum Refining and Petrochemistry of the Republic of Bashkortostan, 12 Iniciativnaya Str., 450065, Ufa, Russian Federation
| | - K P Birin
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky Prospect, Building 4, 119071, Moscow, Russian Federation
| | - P V Ivchenko
- M.V. Lomonosov Moscow State University, Department of Chemistry, Moscow, Russian Federation. and A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, Russian Federation
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20
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Ebrahimi T, Aluthge DC, Patrick BO, Hatzikiriakos SG, Mehrkhodavandi P. Air- and Moisture-Stable Indium Salan Catalysts for Living Multiblock PLA Formation in Air. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01939] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tannaz Ebrahimi
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
- Department
of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC Canada, V6T1Z3
| | - Dinesh C. Aluthge
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
| | - Brian O. Patrick
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
| | - Savvas G. Hatzikiriakos
- Department
of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC Canada, V6T1Z3
| | - Parisa Mehrkhodavandi
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
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21
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Nifant’ev IE, Minyaev ME, Shlyakhtin AV, Ivchenko PV, Churakov AV. Bulky ortho -disubstituted phenolates of magnesium, calcium and zinc: structural features and comparison of catalytic properties in polymerization of ɛ-caprolactone and rac -lactide. MENDELEEV COMMUNICATIONS 2017. [DOI: 10.1016/j.mencom.2017.07.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Nifant’ev IE, Ivchenko PV, Shlyakhtin AV, Ivanyuk AV. Polymerization of trimethylene carbonate and lactones in the presence of magnesium monoionolate: A comparative theoretical and experimental study. POLYMER SCIENCE SERIES B 2017. [DOI: 10.1134/s1560090417020075] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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23
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Ivchenko PV, Shlyakhtin AV, Nifant’ev IE. Ring-opening polymerization of glycolide and rac -lactide, catalyzed by aryloxy magnesium complexes: DFT study of reaction profile and stereocontrol mechanism. MENDELEEV COMMUNICATIONS 2017. [DOI: 10.1016/j.mencom.2017.05.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Nifant'ev IE, Shlyakhtin AV, Bagrov VV, Komarov PD, Kosarev MA, Tavtorkin AN, Minyaev ME, Roznyatovsky VA, Ivchenko PV. Controlled ring-opening polymerisation of cyclic phosphates, phosphonates and phosphoramidates catalysed by heteroleptic BHT-alkoxy magnesium complexes. Polym Chem 2017. [DOI: 10.1039/c7py01472d] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BHT-Mg-alkoxides are readily available and effective ROP catalysts for cyclic ethylene phosphate monomers and outperform conventional organocatalysts in versatility.
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Affiliation(s)
- I. E. Nifant'ev
- M.V. Lomonosov Moscow State University
- Department of Chemistry
- Moscow
- Russian Federation
- A.V. Topchiev Institute of Petrochemical Synthesis
| | - A. V. Shlyakhtin
- M.V. Lomonosov Moscow State University
- Department of Chemistry
- Moscow
- Russian Federation
| | - V. V. Bagrov
- M.V. Lomonosov Moscow State University
- Department of Chemistry
- Moscow
- Russian Federation
| | - P. D. Komarov
- M.V. Lomonosov Moscow State University
- Department of Chemistry
- Moscow
- Russian Federation
| | - M. A. Kosarev
- M.V. Lomonosov Moscow State University
- Department of Chemistry
- Moscow
- Russian Federation
| | - A. N. Tavtorkin
- M.V. Lomonosov Moscow State University
- Department of Chemistry
- Moscow
- Russian Federation
- A.V. Topchiev Institute of Petrochemical Synthesis
| | - M. E. Minyaev
- A.V. Topchiev Institute of Petrochemical Synthesis
- Russian Academy of Sciences
- Moscow
- Russian Federation
| | - V. A. Roznyatovsky
- M.V. Lomonosov Moscow State University
- Department of Chemistry
- Moscow
- Russian Federation
| | - P. V. Ivchenko
- M.V. Lomonosov Moscow State University
- Department of Chemistry
- Moscow
- Russian Federation
- A.V. Topchiev Institute of Petrochemical Synthesis
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25
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d'Arcy R, Burke J, Tirelli N. Branched polyesters: Preparative strategies and applications. Adv Drug Deliv Rev 2016; 107:60-81. [PMID: 27189232 DOI: 10.1016/j.addr.2016.05.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 04/19/2016] [Accepted: 05/06/2016] [Indexed: 10/21/2022]
Abstract
In the last 20years, the availability of precision chemical tools (e.g. controlled/living polymerizations, 'click' reactions) has determined a step change in the complexity of both the macromolecular architecture and the chemical functionality of biodegradable polyesters. A major part in this evolution has been played by the possibilities that controlled macromolecular branching offers in terms of tailored physical/biological performance. This review paper aims to provide an updated overview of preparative techniques that derive hyperbranched, dendritic, comb, grafted polyesters through polycondensation or ring-opening polymerization mechanisms.
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26
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Nifant'ev IE, Shlyakhtin AV, Tavtorkin AN, Ivchenko PV, Borisov RS, Churakov AV. Monomeric and dimeric magnesium mono-BHT complexes as effective ROP catalysts. CATAL COMMUN 2016. [DOI: 10.1016/j.catcom.2016.09.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
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27
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Lai SM, Chiou YC, Chen GF, Liao MY, Tzen JTC, Lai P. Enhanced Nuclear Localization of Photosensitizer Using Artificial Oil Bodies for Photodynamic Therapy. SMART SCIENCE 2016. [DOI: 10.1080/23080477.2016.1255293] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Kottalanka RK, Harinath A, Rej S, Panda TK. Group 1 and group 2 metal complexes supported by a bidentate bulky iminopyrrolyl ligand: synthesis, structural diversity, and ε-caprolactone polymerization study. Dalton Trans 2015; 44:19865-79. [PMID: 26511076 DOI: 10.1039/c5dt03222a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report here a series of alkali and alkaline earth metal complexes, each with a bulky iminopyrrolyl ligand [2-(Ph3CN=CH)C4H3NH] (1-H) moiety in their coordination sphere, synthesized using either alkane elimination or silylamine elimination methods or the salt metathesis route. The lithium salt of molecular composition [Li(2-(Ph3CN=CH)C4H3N)(THF)2] (2) was prepared using the alkane elimination method, and the silylamine elimination method was used to synthesize the dimeric sodium and tetra-nuclear potassium salts of composition [(2-(Ph3CN=CH)C4H3N)Na(THF)]2 (3) and [(2-(Ph3CN=CH)C4H3N)K(THF)0.5]4 (4) respectively. The magnesium complex of composition [(THF)2Mg(CH2Ph){2-(Ph3CN=CH)C4H3N}] (5) was synthesized through the alkane elimination method, in which [Mg(CH2Ph)2(OEt2)2] was treated with the bulky iminopyrrole ligand 1-H in 1 : 1 molar ratio, whereas the bis(iminopyrrolyl)magnesium complex [(THF)2Mg{2-(Ph3CN=CH)C4H3N}2] (6) was isolated using the salt metathesis route. The heavier alkaline earth metal complexes of the general formula {(THF)nM(2-(Ph3CN=CH)C4H3N)2} [M = Ca (7), Sr (8), and n = 2; M = Ba (9), n = 3] were prepared in pure form using two synthetic methods: in the first method, the bulky iminopyrrole ligand 1-H was directly treated with the alkaline earth metal precursor [M{N(SiMe3)2}2(THF)n] (where M = Ca, Sr and Ba) in 2 : 1 molar ratio in THF solvent at ambient temperature. The complexes 7-9 were also obtained using the salt metathesis reaction, which involves the treatment of the potassium salt (4) with the corresponding metal diiodides MI2 (M = Ca, Sr and Ba) in 2 : 1 molar ratio in THF solvent. The molecular structures of all the metal complexes (1-H, 2-9) in the solid state were established through single-crystal X-ray diffraction analysis. The complexes 5-9 were tested as catalysts for the ring-opening polymerization of ε-caprolactone. High activity was observed in the heavier alkaline earth metal complexes 7-9, with a very narrow polydispersity index in comparison to that of magnesium complexes 5 and 6.
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Affiliation(s)
- Ravi K Kottalanka
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - A Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - Supriya Rej
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
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29
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Ren Y, Wei Z, Leng X, Wang Y, Li Y. Boric acid as biocatalyst for living ring-opening polymerization of ε -caprolactone. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.09.063] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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30
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Tseng HC, Chen FS, Chiang MY, Lu WY, Chen YH, Lai YC, Chen HY. Optimizing ring-opening polymerization of ε-caprolactone by using aluminum complexes bearing amide as catalysts and their application in synthesizing poly-ε-caprolactone with special initiators and other polycycloesters. RSC Adv 2015. [DOI: 10.1039/c5ra21252a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
A series of aluminum complexes bearing amidate ligands, including acylamide, sulfonamide, and aryl carbamate, was synthesized.
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Affiliation(s)
- Hsi-Ching Tseng
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung
- Republic of China
| | - Fu-Shen Chen
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung
- Republic of China
| | - Michael Y. Chiang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung
- Republic of China
- Department of Chemistry
| | - Wei-Yi Lu
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung
- Republic of China
- Department of Chemistry
| | - Yu-Hsieh Chen
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung
- Republic of China
| | - Yi-Chun Lai
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung
- Republic of China
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung
- Republic of China
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31
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Wilson JA, Hopkins SA, Wright PM, Dove AP. ‘Immortal’ ring-opening polymerization of ω-pentadecalactone by Mg(BHT)2(THF)2. Polym Chem 2014. [DOI: 10.1039/c4py00034j] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ‘immortal’ ring-opening polymerization (iROP) of pentadecalactone (PDL), catalysed by magnesium 2,6-di-tert-butyl-4-methylphenoxide (Mg(BHT)2(THF)2) under non-inert conditions is reported for the first time.
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32
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Fang YY, Gong WJ, Shang XJ, Li HX, Gao J, Lang JP. Synthesis and structure of a ferric complex of 2,6-di(1H-pyrazol-3-yl)pyridine and its excellent performance in the redox-controlled living ring-opening polymerization of ε-caprolactone. Dalton Trans 2014; 43:8282-9. [DOI: 10.1039/c4dt00475b] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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