Carbonate phosphonium salts as catalysts for the transesterification of dialkyl carbonates with diols. The competition between cyclic carbonates and linear dicarbonate products
At 90–120 °C, in the presence of methylcarbonate and bicarbonate methyltrioctylphosphonium salts as catalysts ([P8881][A]; [A] = MeOCO2 and HOCO2), the transesterification of non-toxic dimethyl- and diethyl-carbonate (DMC and DEC, respectively) with 1,X-diols (2 ≤ X ≤ 6) proceeds towards the formation of cyclic and linear products. In particular, 1,2-propanediol and ethylene glycol afford propylene-
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.
ASYMMETRICAL CARBONATE COMPOUND AND MANUFACTURING METHOD THEREOF
申请人:Ube Industries, Ltd.
公开号:EP2253710A1
公开(公告)日:2010-11-24
This is to provide a process for preparing an asymmetric carbonate compound from a symmetric carbonate compound and an ester compound with good yield, which is simple and easy, and industrially suitable.
Disclosed is a process for prepaing an asymmetric carbonate compound which comprises allowing a symmetric carbonate compound represented by the formula (1) to react with an ester compound represented by the formula (2) in the presence of a hydrolase.