نتایج جستجو برای: ring opening of epoxides

تعداد نتایج: 21178628  

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده اقتصادو علوم اجتماعی 1390

today, the route for economic development in most countries is the same as international open competitive economy. economic institutes well known that supportive public economy belonged on the past and they may compete in the global economy. it is obvious that if they have no competitive potency or not familiar with competition technique, they may be devastated. banking system aims to collect t...

Journal: :Catalysts 2022

Recent knowledge in chemistry has enabled the material utilization of greenhouse gas (CO2) for production organic carbonates using mild reaction conditions. Organic carbonates, especially cyclic are applicable as green solvents, electrolytes batteries, feedstock fine chemicals and monomers polycarbonate production. This review summarizes new developments ring opening epoxides with subsequent CO...

2017
Sungho Yoon

b-Lactones are important intermediates for ring-opening polymerization to form poly(b-hydroxyalkanoates), a naturally occurring biodegradable and thermoplastic polyester. Many synthetic methods are available for preparing b-lactones, among which catalytic ring-opening carbonylation of epoxides has received considerable attention because of its ability to produce enantiopure b-lactones. Over the...

2018
Maria J. Sanford Nathan J. Van Zee Geoffrey W. Coates

The alternating copolymerization of epoxides and cyclic anhydrides is an increasingly popular route to aliphatic polyesters that are of interest as biodegradable replacements for petroleum-based polymers and for use in the biomedical field. However, broad and bimodal molecular weight distributions in these polymerizations continues to be an issue, limiting synthesis of multiblock copolymers. By...

Journal: :Science China-chemistry 2022

Biodegradable polymers are a promising sustainable alternative to conventional petroleum-based and have attracted recent extensive research interest due their potential environmental friendliness sustainability. Among them, aliphatic polyesters polycarbonates the most extensively studied ones. The metal-catalyzed ring-opening polymerization (ROP) of cyclic esters copolymerization (ROCOP) epoxid...

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