gem-dibromocyclopropanes with n-butyllithium in THF under argon at–78°С followed by purging the reaction mixture with dry CO2 was used to synthesize cis- and/or trans-1-halocyclopropane-1-carboxylic acids in 30–56% yields. The yields of the target products could be increased to 76–83% by the addition of an equimolar amount of LiCl to the reaction mixture. The highest salt effect was obtained with lithium
在
氩气下于–78°C下,使宝石-二
氯和宝石-二
溴环丙烷与
正丁基锂在THF中反应,然后用干燥的CO 2吹扫反应混合物,以合成顺式和/或反式-1-卤代
环丙烷-1 -
羧酸的收率为30–56%。通过向反应混合物中添加等摩尔量的LiCl,可以将目标产物的收率提高到76-83%。用原位生成的
氯化锂可获得最高的盐效应(88–96%)。