Synthesis of iridium and rhodium complexes with new chiral phosphine-NHC ligands based on 1,1′-binaphthyl framework and their application in asymmetric hydrogenation
highly efficient hydroesterification of alkynesemployingarylformates has been developed without the use of externalcarbonmonoxide and at ambient pressure. The reaction in the presence of a palladium-xantphos catalyst system selectively affords α,β-unsaturated esters in good to high yields. Use of an aryl formate is crucial and alkyl formates did not react at all. The hydroesterification of norbornene
Conjugate reduction of aryl acrylates with tributyltin hydride in the presence of magnesium bromide diethyl etherate
作者:Satomi Hirasawa、Hajime Nagano、Yoko Kameda
DOI:10.1016/j.tetlet.2004.01.028
日期:2004.3
The conjugate reduction of aryl acrylates performed with tributyltinhydride in the presence of magnesium bromide diethyl etherate in dichloromethane gave the corresponding saturated esters in moderate to high yields. The reduction of α-methylene-γ-benzyloxycarboxylic acid esters proceeded syn-selectively, but α-methylene-β-oxycarboxylic acid esters afforded reductive elimination products under the
We developed a copper-catalyzed enantio- and diastereoselective boron conjugate addition to α-alkyl α,β-unsaturated esters under base-free conditions. The approach showed excellent enantioselectivities (87–99% ee) and moderate to good conversions (51–99%), albeit with moderate diastereoselectivities (1 : 1–17 : 1 dr). The synthetic utility of this protocol was demonstrated.
Photosensitive composition for volume hologram recording and photosensitive medium for volume hologram recording
申请人:DAI NIPPON PRINTING CO., LTD.
公开号:EP1231511A2
公开(公告)日:2002-08-14
A photosensitive composition and A photosensitive medium for volume hologram recording comprises a photopolymerization reactive compound (a monomer) and any one of the following binder: (a) an organic-inorganic hybrid polymer obtainable by copolymerizing an organometallic compound of the formula 1 " R1m M1 (OR2)n " and an ethylenic monomer and/or its hydrolyzed polycondensate; (b) an organic-inorganic hybrid polymer obtainable by copolymerizing an organometallic compound of the formula 3 " R4m Si (OR5)n " and an ethylenic monomer and/or its hydrolyzed polycondensate; and (c) a binder resin bonded to a metal or a combination use of a binder resin containing a hydroxyl group and/or carboxyl group and a metal chelate compound.
Process for the manufacture of copolymers of formaldehyde and diphenyl oxide
申请人:National Starch and Chemical Investment Holding Corporation
公开号:EP1329467A2
公开(公告)日:2003-07-23
A process for the manufacture of copolymers of formaldehyde and diphenyl oxide and a carboxylic acid uses and acid with a pKa in the range of 1.2 to 3 as the catalyst.