二乙氧基膦酰乙酸叔丁脂的热裂解反应

Pyrolysis of ■-Butyl Diethoxyphosphinylacetate

二烷氧基膦酰乙酸酯为一类重要的Wittig-Horner试剂,也可用作增塑剂、防火剂和萃取剂等。因此研究这类化合物的性质具有实际意义,我们已报道过用相转移催化的简便方法合成二烷氧基膦酰乙酸酯,并总结了它们的正、负离子质谱,探讨其断裂规律及可能的断裂途径。但有关这类化合物的热裂解反应至今研究得尚不多。

This paper is concerned with the pyrolysis of t-butyl diethoxyphosphinylacetate at150℃. Examination of the IR, ~1H NMR, GC pK? and GC-MS of the reaction mixture indi-cated the presence of ethyl diethoxyphosphinylacetate, ethyl ethoxyhydroxyphosphinylacetate,ethyl dihydroxyphosphinylacetate, diethoxyphosphinylacetic acid, ethoxyhydroxyphosphinyla-cetic acid, diethyl methylphosphonate and monoethyl methylphosphonate. Ethyl diethylphos-phinylacetate and diethyl methylphosphonate have been isolated from the product mixture.The mechanism of pyrolysis of t-butyl diethoxyphosphinylacetate is also discussed. The influence of the temperature of reaction on the pyrolysis of t-butyl diethoxyphos-phinylacetate has been investigated.