Formation of novel 1:2 adducts between bun3P.CS2 and electron-deficient alkynes
作者:R.Alan Aitken、Swati V. Raut、George Ferguson
DOI:10.1016/s0040-4020(01)80474-9
日期:1992.1
The zwitterionic adduct between tri-n-butylphosphine and carbon disulphide reacts under neutral conditions with two equivalents of dimethyl- and diethyl acetylenedicarboxylate, dibenzoylacetylene and methyl benzoylpropiolate to give novel crystalline dithiole-containing phosphorus ylides. An X-ray structure, spectroscopic and chemical properties all show these to be significantly stabilised by delocalisation