作者:Y. Kawakami、K. Tajima、T. Tsuruta
DOI:10.1016/0040-4020(73)80098-5
日期:1973.1
Selective syntheses for some 1-halogeno-2-alkyl-cis-1,2-cyclopropanedicarboxylic esters were studied. In a ring formation between α-halogenoacetic and α-propylacrylic esters, lithium hydride was a much better condensing agent than sodium hydride for the selective syntheses of cyclopropanedicarboxylic ester possessing two different alcohol residues. A greater reactivity was found at the ester group
研究了一些1-卤代-2-烷基-顺式-1,2-环丙烷二羧酸酯的选择性合成。在α-卤代乙酸酯和α-丙基丙烯酸酯之间的环形成中,对于具有两个不同醇残基的环丙烷二羧酸酯的选择性合成,氢化锂比氢化钠是更好的缩合剂。在通过碱金属叔丁醇进行酯交换反应以及在其通过KOH的部分水解中,发现与碳1连接的酯基的反应性比与碳2连接的酯的反应性大。据推测这归因于烷基和Cl原子的感应效应的差异。