Chlorine-Free Synthesis of Organic Alkyl Carbonates and Five- and Six-Membered Cyclic Carbonates
作者:Sang-Hyun Pyo、Rajni Hatti-Kaul
DOI:10.1002/adsc.201500654
日期:2016.3.3
report presents a new, one‐pot, facile, selective and green method for methoxycarbonylation of alcohols and synthesis of five‐ and six‐membered cyclic carbonates from corresponding alcohols with dimethyl carbonate (DMC) in the presence of molecular sieves without any additional solvent and catalyst. Syntheses of bifunctional structures comprising a six‐membered cyclic carbonate with allyl ether and methacrylate
[EN] CARBACEPHEM ß-LACTAM ANTIBIOTICS<br/>[FR] ANTIBIOTIQUES BÊTA-LACTAMES À CARBACÉPHÈME
申请人:ACHAOGEN INC
公开号:WO2009055696A1
公开(公告)日:2009-04-30
Carbacephem β-lactam antibiotics having the following chemical structures (I) and (II) are disclosed, including stereoisomers, pharmaceutically acceptable salts, esters and prodrugs thereof, wherein Ar2, R1, R2 and R3 are as defined herein. The compounds are useful for the treatment of bacterial infections, in particular those caused by methicillin-resistant Staphylococcus spp.
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
CATALYSTS FOR THE PREPARATION OF CARBONATES FROM EPOXIDES AND CO2
申请人:Deglmann Peter
公开号:US20130060001A1
公开(公告)日:2013-03-07
A macrocycle based on β-diketimines, a process for preparing the inventive macrocycle, an uncharged macrocyclic dimetallic complex based on the inventive macrocycle, and a process for preparing the uncharged macrocyclic dimetallic complex, the use of the uncharged macrocyclic dimetallic complex as a polymerization catalyst in the polymerization of carbon dioxide with one or more epoxides, a process for preparing polycarbonates by reacting carbon dioxide with one or more epoxides in the presence of the inventive uncharged macrocyclic dimetallic complex, and a polycarbonate prepared by the process according to the invention.
Acid-catalysed carboxymethylation, methylation and dehydration of alcohols and phenols with dimethyl carbonate under mild conditions
作者:Saimeng Jin、Andrew J. Hunt、James H. Clark、Con Robert McElroy
DOI:10.1039/c6gc01826b
日期:——
Dimethyl carbonate (DMC) chemistry has been extended to include acid-catalysed reactions of different aliphatic alcohols and phenols. For the first time, p-toluenesulfonic acid (PTSA), H2SO4, AlCl3 and FeCl3 have been...