Regioselective phosphoranylation and cyclodehydration of triols with diethoxytriphenylphosphorane
作者:Jeffery W. Kelly、Slayton A. Evans
DOI:10.1021/ja00284a036
日期:1986.11
The structures of the 2,2,2-triphenyl-1,3,2-dioxaphospholanes are readily assessed from /sup n/J/sub /sup 31/P-/sup 13/C/ (n = 2,3) coupling constants and /sup 31/P chemical shifts. Alkyl and aryl substituents attached to the dioxaphospholane ring also induce pronounced substituent shielding effects on the /sup 31/P resonance of the phospholanes. These effects are useful in corroborating the structural
二乙氧基三苯基膦 (DTPP) 选择性地二膦酰化 1,2,4-三醇中的邻二醇官能团,提供热力学稳定的 2,2,2-三苯基-1,3,2-二氧杂膦。当经受热解条件时,这些二氧杂磷杂环戊烷分解形成瞬态甜菜碱,随后通过三苯基氧化膦的 3-exo-tet 挤出而坍塌成环氧化物。2,2,2-triphenyl-1,3,2-dioxaphospholanes 的结构很容易从 /sup n/J/sub /sup 31/P-/sup 13/C/ (n = 2,3) 耦合评估常数和 /sup 31/P 化学位移。连接到二氧杂磷杂环戊烷环上的烷基和芳基取代基也会对磷杂环戊烷的 /sup 31/P 共振产生显着的取代基屏蔽效应。这些效应有助于证实二氧正膦的结构归属。