Oxidation of Phosphanes with Orthoquinones: An Unusual Decomposition of an Unexpectedly Stable Zwitterion
作者:Igor Shevchenko、Vasyl Andrushko、Enno Lork、Gerd‐Volker Röschenthaler
DOI:10.1002/ejic.200600579
日期:2007.1
Oxidation of the ylide (Et2N)2P[=C(CN)CH(CF3)2]CH2P(NEt2)2 (3) with tetrachloroorthobenzoquinone (TOB) does not give the expected 1,3,2-dioxaphospholane but stops at the formation of the unusually stable intermediate zwitterion 6. The molecular structure of 6 was established by X-ray analysis. In solution at temperatures above 15 °C zwitterion 6 undergoes an unusual decomposition into symmetrical carbodiphosphorane
用四氯邻苯醌 (TOB) 氧化叶立德 (Et2N)2P[=C(CN)CH(CF3)2]CH2P(NEt2)2 (3) 不会产生预期的 1,3,2-二氧杂膦,但在形成时停止异常稳定的中间体两性离子 6。6 的分子结构是通过 X 射线分析确定的。在温度高于 15 °C 的溶液中,两性离子 6 发生异常分解,生成对称的碳二正膦 7 和六氟异戊腈 8。(© Wiley-VCH Verlag GmbH & Co. KGaA,69451 Weinheim,德国,2007)