31P chemical shifts and31P—−13C coupling effects in the stereochemical analysis of benzo-7-phosphanorbornene derivatives
作者:Louis D. Quin、F. Christian Bernhardt
DOI:10.1002/mrc.1260231110
日期:1985.11
The first phosphines based on the benzo‐7‐phosphanorbornene system have been prepared and found to have extremely deshielded 31P nuclei. The phosphine with a P‐tert‐butyl group gives the most downfield value (δ +152.5) ever recorded for a tertiary phosphine. The lone‐pair orientation in phosphines controls the magnitude of 2J (PC) and 3J (PC), and these effects were used to determine stereochemical
第一种基于苯并-7-磷化冰片烯系统的膦已被制备,并发现其具有极度去屏蔽的 31P 核。具有对叔丁基的膦给出了叔膦有史以来记录的最低场值 (δ +152.5)。膦中的孤对取向控制 2J (PC) 和 3J (PC) 的大小,这些效应用于确定膦的立体化学特征。这些化合物是由异膦吲哚氧化物与降冰片二烯的 Diels-Alder 加合物的 HSiCl3吡啶还原形成的。13C NMR 也用于确认这些氧化膦的归属。