Beta-halogenoformyl-ethyl phosphinic acid halides of the general formula: R.sup.1 XP(O)--CHR.sup.2 --CHR.sup.3 --CO--X, in which R.sup.1 stands for an alkyl radical having 1, 2, 3 or 4 carbon atoms or a phenyl radical, R.sup.2 and R.sup.3 each stand for hydrogen or CH.sub.3, and X stands for chlorine or bromine, are produced by reacting an alkyldihalogenophosphine having 1, 2, 3 or 4 carbon atoms in its alkyl radical, or a phenyldihalogenophosphine, with acrylic acid, methacrylic acid or crotonic acid. To this end, a quantity of the desired beta-halogenoformyl-ethyl phosphinic acid halide is introduced into a reaction zone and circulated in the form of a melt at 50.degree. to 120.degree. C and at a flow rate of 0.1 to 3 m/s., through a heat exchanger; the circulated phosphonic acid halide is admixed with equimolar proportions of the respective starting materials and the resulting mixture is allowed to undergo reaction for a period of 5 to 120 minutes, and beta-halogenoformyl-ethyl phosphinic acid halide is removed.
通式为R.sup.1 XP(O)--CHR.sup.2 --CHR.sup.3 --CO--X的Beta-卤代甲酰基
乙基膦酸卤化物,其中R.sup.1代表具有1、2、3或4个
碳原子的烷基基团或
苯基,R.sup.2和R.sup.3各代表
氢或CH.sub.3,X代表
氯或
溴,通过将具有1、2、3或4个
碳原子的烷基基团或
苯基的二卤代膦与
丙烯酸、
甲基丙烯酸或
巴豆酸反应而制得。为此,将所需的Beta-卤代甲酰基
乙基膦酸卤化物数量引入反应区,并以50℃至120℃的熔融形式以0.1至3m/s的流速通过换热器循环。循环的
膦酸卤化物与各自的起始材料按当量混合,所得混合物在5至120分钟的时间内进行反应,然后去除Beta-卤代甲酰基
乙基膦酸卤化物。