申请人:Bayer Aktiengesellschaft
公开号:US04342704A1
公开(公告)日:1982-08-03
A process for the preparation of a 1,1-dichloroalkene of the formula ##STR1## in which R.sup.1 is hydrogen or an optionally substituted alkyl, alkenyl, alkynyl, aralkyl or aryl radical, and R.sup.2 is an optionally substituted alkyl, alkenyl, alkynyl, aralkyl, aralkenyl or aryl radical, or cycloalkyl which is optionally substituted by halogen, alkyl, alkanoyl, carbamoyl, cyano or phenyl, or R.sup.1 and R.sup.2 together form a hydrocarbon chain which is optionally branched and/or optionally contains a fused benzene ring, comprising reacting an aldehyde or ketone of the formula ##STR2## with a dichloromethane-phosphonic acid ester of the formula ##STR3## in which R.sup.3 each independently is alkyl or phenyl or the two radicals R.sup.3 together are alkanediyl, in the presence of a base at a temperature between about -50.degree. and +50.degree. C. Preferably either the base is metered into a mixture of the aldehyde or ketone and phosphonic acid ester or the ester is added to a mixture of the base and aldehyde or ketone.
制备1,1-二氯烯的方法,其中R.sup.1是氢或可选择地取代的烷基、烯基、炔基、芳基烷基或芳基基团,而R.sup.2是可选择地取代的烷基、烯基、炔基、芳基烷基、芳基烯基或芳基基团,或者是可选择地通过卤素、烷基、酰基、氨基、氰基或苯基取代的环烷基,或者R.sup.1和R.sup.2一起形成一个可选择地分支和/或可选择地包含融合苯环的碳氢链,包括在大约-50度和+50度之间的温度下,在碱的存在下,将具有以下式子的醛或酮与具有以下式子的二氯甲磷酸酯反应:其中R.sup.3各自独立地是烷基或苯基,或两个基团R.sup.3一起是烷二基。最好的方法是将碱加入到醛或酮和磷酸酯的混合物中,或者将酯加入到碱和醛或酮的混合物中。