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In this paper, three alkyl substituted dimethyl phosphonates have been synthesized by trimethyl phosphite with 1-Bromopentane, 1-Bromohexane and 1,2-Dibromoethane. 以溴戊烷、溴己烷、1，2-二溴乙烷和亞磷酸三甲酯為原料，分別合成了戊基、己基、溴乙基取代的三種膦酸二甲酯化合物。