Hydrogenation of CO<sub>2</sub>
-Derived Carbonates and Polycarbonates to Methanol and Diols by Metal-Ligand Cooperative Manganese Catalysis
作者:Viktoriia Zubar、Yury Lebedev、Luis Miguel Azofra、Luigi Cavallo、Osama El-Sepelgy、Magnus Rueping
DOI:10.1002/anie.201805630
日期:2018.10.8
The first base‐metal‐catalysed hydrogenation of CO2‐derived carbonates to alcohols is presented. The reaction proceeds under mild conditions in the presence of a well‐defined manganese complex with a loading as low as 0.25 mol %. The non‐precious‐metal homogenous catalytic system provides an indirect route for the conversion of CO2 into methanol with the co‐production of value‐added (vicinal) diols
Efficient reduction of cyclic and linear organic carbonates catalyzed by a readily available earth alkaline catalyst has been achieved. The described homogenous reaction based on a ligand-free magnesiumcatalyst provides an indirect route for the conversion of CO2 into valuable alcohols. The reaction proceeds with high yields under mild reaction conditions, with low catalyst loading and short reaction times
Selective, Green Synthesis of Six-Membered Cyclic Carbonates by Lipase-Catalyzed Chemospecific Transesterification of Diols with Dimethyl Carbonate
作者:Sang-Hyun Pyo、Rajni Hatti-Kaul
DOI:10.1002/adsc.201100822
日期:2012.3.16
A facile and greensynthesis of six‐membered cycliccarbonates, the potential monomers for isocyanate‐free polyurethanes and polycarbonates, was achieved by transesterification of diols with dimethylcarbonate catalyzed by immobilized Candida antarctica lipase B, Novozym®435, followed by thermal cyclization in a solvent‐free medium. The difference in the chemospecificity of the lipase for the primary
[EN] METHOD FOR PRODUCING CYCLIC CARBONATES<br/>[FR] PROCÉDÉ POUR PRODUIRE DES CARBONATES CYCLIQUES
申请人:HATTI-KAUL RAJNI
公开号:WO2012158107A1
公开(公告)日:2012-11-22
Linear or cyclic carbonates as potential monomers for isocyanate-free polyurethanes and polycarbonates were prepared from polyols and dialkylcarbonatesor diphenyl carbonates. This invention was developed to produce linear or cyclic carbonates with or without using catalysts. Polyol compounds were reacted with carbonates such as dimethylcarbonate and diethylcarbonate to produce thecorresponding linear and/or cyclic carbonate.
Bio-agent delivery systems based on coated degradable biocompatible hydrogels
申请人:UNIVERSITEIT GENT
公开号:EP1733718A1
公开(公告)日:2006-12-20
A microcapsule of a degradable biocompatible hydrogel being coated by two or more alternating layers of at least one positively charged biocompatible polypeptide selected from the group consisting of poly-L-arginine and poly-L-ornithine and at least one biocompatible polyanion selected from the group consisting of dextran sulfate, chondroitin sulfate, poly-L-glutamic acid and poly-L-aspartic acid.