Synthesis of (+)- and (-)-Gossonorol and Cyclisation to Boivinianin B
作者:Keren Abecassis、Susan E. Gibson
DOI:10.1002/ejoc.201000391
日期:2010.5
The first enantioselective synthesis of gossonorol has been achieved in good overall yield and excellent enantioselectivity, demonstrating the utility of a novel approach to enantiopure tertiary benzylic alcohols. Epoxidation of enantiopure gossonorol followed by acid-catalysed cyclisation gave a diastereoisomeric mixture of boivinianinB,typical of the diastereoisomeric mixtures of this compound found
第一个对映选择性合成的 gossonorol 已经以良好的总收率和优异的对映选择性实现,证明了一种新方法对对映纯叔苄醇的效用。对映体纯 gossonorol 环氧化,然后酸催化环化得到 boivinianin B 的非对映异构混合物,这是自然界中发现的这种化合物的典型非对映异构混合物。非对映异构体的分离和对映体纯度的测定表明,在环氧化/环化反应过程中,gossonorol 的苯甲醇的立体化学完整性得到了保留。
CURABLE COMPOSITION FOR IMPRINTS, PATTERNING METHOD AND PATTERN
申请人:Kodama Kunihiko
公开号:US20110236595A1
公开(公告)日:2011-09-29
Provided is a curable composition for imprints having good patternability and dry etching resistance. Disclosed is a curable composition for imprints comprising a polymerizable monomer (Ax) having a substituent having an aromatic group and having a molecular weight of 100 or more, and a photopolymerization initiator.
Salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal salts of the copolymers and color-developing sheets employing the agents
申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0268878A2
公开(公告)日:1988-06-01
Disclosed herein are salicylic acid copolymers having a weight average molecular weight of 500 10,000 and obtained (a) by condensing salicylic acid (i) with a benzyl alcohol (ii) and/or benzyl ether (iii) or a benzyl halide (iv) in the presence of an acid catalyst or (b) by reacting a co-condensation resin of (i) and (ii) and/or (iii) with (iv) or (c) by reacting a co-condensation resin of (i) and (ii) and/or (iii) or (iv) with a styrene derivative in the presence of an acid catalyst; multivalent metal salts of the salicylic acid copolymers; color-developing agents comprising the multivalent metal salts; and color-developing sheets suited for pressure-sensitive copying paper and comprising the color-developing agents. Their production processes are also disclosed.