Preparation of substituted vinylcyclopropane-carboxylic acid esters
    53.
    发明授权
    Preparation of substituted vinylcyclopropane-carboxylic acid esters 失效
    取代的乙烯基环丙烷 - 羧酸酯的制备

    公开(公告)号:US4256907A

    公开(公告)日:1981-03-17

    申请号:US899664

    申请日:1978-04-24

    摘要: A process for the preparation of a substituted vinyl-cyclopropanecarboxylic acid ester of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is alkyl with 1-4 carbon atoms or halogen,R.sup.3 is halogen, phenoxy or phenoxy substituted by alkyl with 1-4 carbon atoms or by halogen,R.sup.4 is halogen or methyl, andn is 0, 1, 2, 3 or 4,comprising saponifying with alkali an ester of the formula ##STR2## in which R.sup.5 is alkyl with 1-4 carbon atoms,thereby to replace R.sup.5 by an alkaline salt group, and directly reacting such salt without intermediate purification with a benzyl chloride of the formula ##STR3## Advantageously the benzyl chloride is obtained by the gas-phase photochlorination of a compound of the formula ##STR4## the chlorination proceeding to about 25 to 75%, and the chlorination mass being employed directly without isolation.

    摘要翻译: 制备下式的取代的乙烯基 - 环丙烷羧酸酯的方法,其中R 1和R 2各自独立地为具有1-4个碳原子的烷基或卤素,R 3为卤素,苯氧基或被烷基取代的苯氧基, 4个碳原子或卤素,R 4是卤素或甲基,n是0,1,2,3或4,其包括用碱皂化其中R 5是具有1-4个碳原子的烷基的式“IMAGE”的酯, 从而用碱性盐基代替R 5,并且直接使这种盐与不经中间纯化的下式的苄基氯反应。有利地,苄基氯是通过气相光氯化式(VI)的化合物获得的 IV),氯化进行到约25至75%,并且氯化质量直接使用而不分离。