本文以二氯苯膦(DCPP)、多聚甲醛和水为原料,采用两步法合成一种重要的磷系阻燃剂羟甲基苯基次膦酸。确定了优化反应条件,第一步为:在少量相转移催化剂存在下,于20℃反应6h,产率达到75.1%;第二步为:在130～140℃回流1h,经合适的溶剂重结晶,产率达83%。此工艺操作简便,能耗低,产率高。 In this paper, dichloro-phenylphosphine (DCPP), paraformaldehyde and water as raw materials, a two-step synthesis of an important phosphorus flame retardant hydroxymethylphenylphosphinic acid. The optimum reaction conditions were determined as follows: the first reaction was as follows: the reaction was carried out at 20 ℃ for 6h in the presence of a small amount of phase transfer catalyst, the yield was 75.1%; the second step was refluxed at 130-140 ℃ for 1h and recrystallized , Yield of 83%. The process is simple, low energy consumption, high yield.