A novel cyclopropene-carboxylate of the formula ##STR1## wherein R is alkyl of 1 to 6 carbon atoms and their preparation and a process using the compounds of formula I to obtain cis compounds of the formula ##STR2##
一种新颖的环
丙烯-
羧酸酯,其
化学式为##STR1##其中R为1至6个碳原子的烷基,以及其制备方法和使用公式I化合物制备公式II顺式化合物的过程。