Dialkyl 4-methylphosphinobutyrates represented by the following general formula;
(wherein R, represents hydrogen atom or acylamino group, and R2 and Rs each represents C1-C5 alkyl group) are intermediates for D,L-2-amino-4-methylphosphinobutyric acid useful as a herbicide, and are prepared by reacting a corresponding vinylacetic acid ester with methylphosphorous acid monoalkyl ester at 100-200"C in the presence of a radical-generating agent or under irradiation with ultraviolet rays.
由以下通式表示的 4-
甲基膦酰基
丁酸二烷基酯
(其中 R 代表氢原子或酰基
氨基,R2 和 Rs 各代表 C1-C5 烷基)是用作
除草剂的 D,
L-2-
氨基-4-
甲基膦丁酸的中间体,其制备方法是在自由基生成剂存在下或在紫外线照射下,使相应的
乙烯基乙酸酯与甲基
磷酸单烷基酯在 100-200 "C 下反应。