[EN] METHOD OF PREPARING POLY(ALKYLENE CARBONATE) VIA COPOLYMERIZATION OF CARBON DIOXIDE/EPOXIDE IN THE PRESENCE OF NOVEL COMPLEX [FR] PROCÉDÉ DE PRÉPARATION DE POLY(CARBONATE D'ALKYLÈNE) PAR COPOLYMÉRISATION DE DIOXYDE DE CARBONE ET D'ÉPOXYDE EN PRÉSENCE D'UN NOUVEAU COMPLEXE
[EN] METHOD OF PREPARING POLY(ALKYLENE CARBONATE) VIA COPOLYMERIZATION OF CARBON DIOXIDE/EPOXIDE IN THE PRESENCE OF NOVEL COMPLEX [FR] PROCÉDÉ DE PRÉPARATION DE POLY(CARBONATE D'ALKYLÈNE) PAR COPOLYMÉRISATION DE DIOXYDE DE CARBONE ET D'ÉPOXYDE EN PRÉSENCE D'UN NOUVEAU COMPLEXE
RECYCLABLE CHIRAL CATALYST FOR ASYMMETRIC NITROALDOL REACTION AND PROCESS FOR THE PREPARATION THEREOF
申请人:COUNCIL OF SCIENTIFIC 7 INDUSTRIAL RESEARCH
公开号:US20150368181A1
公开(公告)日:2015-12-24
The present invention relates to preparation of highly efficient chiral recyclable homogeneous catalysts generated in situ by the reaction of chiral oligomeric [H
4
] ligands and a metal salt taken in 1:1 molar ratio for asymmetric nitroaldol reaction, wherein nitroaldol reactions of various aldehydes such as aromatic, aliphatic α,β-unsaturated aldehydes, alicyclic aldehydes and nitroalkenes were carried out to produce optically active β-nitroalcohols in high yield and with moderate to excellent enantioselectivity (ee up to >95%) in presence of a base and an optically active chiral recyclable homogeneous catalyst represented by the following formula (I).
stable inherently chiral uranyl−salophen complexes, the newly synthesized compound 3 featuring a dodecamethylene chain was expected to be a promising candidate. Unexpectedly, dynamic HPLC on a enantioselective column showed that it still undergoes enantiomerization at high temperature. By comparison with the dynamic behavior of compounds 4 and 5, it was found that the enantiomerization rate is independent
Soman is a highly toxic nerve agent with strong inhibition of acetylcholinesterase (AChE), but of the few reactivators showing antidotal efficiency for soman-inhibited AChE presently are all permanently charged cationic oximes with poor penetration of the blood-brain barrier. To overcome this problem, uncharged reactivators have been designed and synthesized, but few of them were efficient for treating
Method of preparing poly(alkylene carbonate) via copolymerization of carbon dioxide/epoxide in the presence of novel complex
申请人:SK Innovation Co., Ltd.
公开号:US10723837B2
公开(公告)日:2020-07-28
Provided is a method of preparing poly(alkylene carbonate) using a molecular weight regulator in a process of preparing a copolymer of carbon dioxide/epoxide using a novel complex synthesized from salen-type ligand including a quaternary ammonium salt as a catalyst. According to the present invention, even though the molecular weight regulator is used, an activity of the catalyst may be stably maintained, whereby the low molecular weight of poly(alkylene carbonate) having a desirable level may be effectively provided. In addition, it is expected that since the novel complex as the catalyst of the present invention has a simple structure as compared to the existing copolymerization catalyst, due to the economical preparation cost thereof, the novel complex may be effectively applied to a large-scale commercial process.