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    • 7. 发明授权
    • Process for the preparation of
2-(2',2',2'-trihalogenoethyl)-4-halogenocyclobutan-1-ones
    • 制备2-(2',2',2'-三卤代乙基)-4-卤代环丁烷-1-酮的方法
    • US4242278A
    • 1980-12-30
    • US948126
    • 1978-10-03
    • Pierre MartinHans GreuterEginhard SteinerDaniel Bellus
    • Pierre MartinHans GreuterEginhard SteinerDaniel Bellus
    • C07C51/60C07C51/62C07C53/50C07C61/15C07C61/40C07C45/45C07C49/105C07C49/115
    • C07C45/45C07C45/67C07C51/60C07C51/62C07C53/50C07C61/15C07C61/40
    • A process for the preparation of 2-(2',2',2',-trihalogenoethyl)-4-halogenocyclobutan-1-ones of the formula ##STR1## in which one of the radicals R.sub.1 and R.sub.2 is methyl and the other is hydrogen or methyl, or R.sub.1 and R.sub.2 together are an alkylene group having 2 to 4 carbon atoms, and X and Y are each chlorine or bromine, comprising reacting a 2,4,4,4-tetrahalogenobutyric acid chloride in the presence of an organic base with an ethylene compound which is disubstituted in 1-position by the radicals R.sub.1 and R.sub.2, as defined above, to form a 2-(2',2',2'-trihalogenoethyl)-2-halogenocyclobutan-1-one and then rearranging the latter, in the presence of a catalyst, into a 2-(2',2',2'-trihalogenoethyl)-4-halogenocyclobutan-1-one of the above formula; said 2-(2',2',2'-trihalogenoethyl)-4-halogenocyclobutan-1-ones being valuable intermediates for the preparation of 2-(2',2'-dihalogenovinyl)-cyclopropanecarboxylic acid and its insecticidally active esters; as well as the 2-(2',2',2'-trihalogenoethyl)-4-halogenocyclobutan-1-ones of the above formula and the intermediates utilized for their preparation.
    • 一种制备式(IMAGE)的2-(2',2',2', - 三卤代乙基)-4-卤代环丁烷-1-酮的方法,其中R 1和R 2之一是甲基,另一个是 氢或甲基,或R 1和R 2一起是具有2至4个碳原子的亚烷基,X和Y各自为氯或溴,包括在有机物存在下使2,4,4,4-四卤代丁酰氯反应 与如上定义的基团R 1和R 2在1位被二取代的亚乙基化合物反应形成2-(2',2',2'-三卤代乙基)-2-卤代环丁烷-1-酮,然后 在催化剂存在下将其重新排列成上式的2-(2',2',2'-三卤代乙基)-4-卤代环丁烷-1-酮; 所述2-(2',2',2'-三卤代乙基)-4-卤代环丁烷-1-酮是制备2-(2',2'-二卤代乙酰基) - 环丙烷羧酸及其杀虫活性酯的有价值的中间体; 以及上述式的2-(2',2',2'-三卤代乙基)-4-卤代环丁烷-1-酮和用于其制备的中间体。