Various methods for the synthesis of some cyclic esters of alkylphosphonic acids, namely 2-alkyl-1,3,2-dioxaphosphorinane-2-oxides and phosphepane-2-oxides were investigated. A dilution method based on the concurrent addition of alkylphosphonyl dichloride and glycol in the presence of triethylamine gave satisfactory results. Cyclic phosphonic ester with exocyclic bulky substituent on phosphorus was prepared with better yield by alcoholysis of tert-butyl phosphonyl dichloride with disodium glycolate. Phase transfer catalytic P-alkylation of cyclic phosphites proceeded smoothly in most cases. The dependence of ring size and structure of the exocyclic alkyl group on the spectroscopic behaviors of these compounds was evaluated.
研究了一些烷基
膦酸的环状酯合成方法,特别是2-烷基-1,3,2-二氧膦烷-2-氧化物和膦烷-2-氧化物。采用基于烷基
膦酸二
氯化物和
甘油在
三乙胺存在下同时添加的稀释方法,取得了令人满意的结果。通过用二
钠甘油酸盐对
叔丁基膦酸二
氯化物进行醇解,可以更好地制备带有外环笨重取代基的环状
膦酸酯,且产率更高。大多数情况下,环状
膦酸酯的相转移催化P-烷基化反应顺利进行。评估了环的大小和外环烷基结构对这些化合物光谱行为的影响。