发明授权
US4962233A Process for preparing racemic dihalovinylcyclopropane carboxylic acid halides 失效
制备外消旋二卤乙烯基环丙烷羧酸卤化物的方法

Process for preparing racemic dihalovinylcyclopropane carboxylic acid
halides
摘要:
Racemic dihalovinylcyclopropane carboxylic acid halides, which are intermediates of such insecticides as permethrin, cypermethrin etc., are prepared by allowing phosphorus iodides, silicon iodides or boron iodides to react with optically active dihalovinylcyclopropane carboxylic acid halides of the formula: ##STR1## wherein X and Y stand for halogen atoms and the mark * indicates an asymmetric carbon atom.
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