A process for the production of 2,2-dimethyl-3-vinyl-cyclopropanecarboxylic acid derivative of the formula ##STR1## in which R.sup.1 is a hydrogen atom, an alkyl group or a radical of an alcohol which can be used in pyrethroids, and X.sup.1 and X.sup.2 each independently is a halogen atom or a fluorine-substituted alkyl radical, comprising adding (a) a polyhalogenoalkene of the formula ##STR2## in which X.sup.3 and X.sup.4 each independently is a halogen atom, to 1-chloro-3,3-dimethyl-pent-4-en-2-one of the formula ##STR3## in the presence of a catalyst which yields free radicals, or in the presence of a metal salt of the VIII main group or of the sub-group IVa, VIIa or Ib of the periodic system, thereby to obtain a mixture of compounds of the formula ##STR4## and (b) reacting either or both of such compounds with a base of a formula (R.sup.1 --O.sup..crclbar.).sub.n M.sup.n+ in which M is an alkali metal or alkaline earth metal, and n is 1 or 2. The end products are known insecticides and intermediates therefor, while the intermediates produced by (a) are novel compounds.
一种生产2,2-二甲基-3-
乙烯基-
环丙烷羧酸衍
生物的方法,其
化学式为##STR1##其中R.sup.1是氢原子、烷基或醇基,可用于拟
除虫菊酯,而X.sup.1和X.sup.2分别是卤素原子或
氟代烷基,包括将
化学式为##STR2##的多卤代烯烃,其中X.sup.3和X.sup.4分别是卤素原子,加入到
化学式为##STR3##的
1-氯-3,3-二甲基-戊-4-烯-2-酮中,在生成自由基的催化剂存在下,或在周期系统的VIII主族或IVa、VIIa或Ib亚族的
金属盐存在下,从而得到
化学式为##STR4##的化合物混合物,然后反应其中一个或两个化合物与
化学式为(R.sup.1 --O.sup..crclbar.).sub.n M.sup.n+的碱基反应,其中M是碱
金属或碱土
金属,n为1或2。最终产物是已知的
杀虫剂及其中间体,而(a)产生的中间体是新颖的化合物。