Novel 2-(2',2'-dihalovinyl)-cyclobutan-1-ones and 2-(2',240 ,2'-trihaloethyl)-cyclobutan-1-ones of the formula ##STR1## are disclosed, wherein R.sub.1 represents --CH.dbd.CX.sub.2 or --CH.sub.2 --CX.sub.3, and X in each case represents chlorine or bromine, one of R.sub.2 and R.sub.3 represents methyl and the other represents hydrogen or methyl, or R.sub.2 and R.sub.3 together represent an alkylene group having 2 to 4 carbon atoms. The invention relates also to the production and the use of the said cyclobutanones.
本发明公开了式子##STR1##中的2-(2',2'-二卤
乙烯基)-
环丁酮和2-(2',2',2'-三卤乙基)-
环丁酮,其中R.sub.1表示--CH.dbd.CX.sub.2或--CH.sub.2--CX.sub.3,X在每种情况下表示
氯或
溴,R.sub.2和R.sub.3中的一个表示甲基,另一个表示氢或甲基,或者R.sub.2和R.sub.3一起表示一个具有2到4个碳原子的烷基基团。本发明还涉及所述
环丁酮的制备和使用。