Old and New Ylid Chemistry

Abstract

A. The mechanism of the Wittig reaction is re-interpreted on the basis of new experimental and theoretical results.B. Reactions of trimethylsilylated phosphorus ylides are described. They allow a reversal of the stereochemistry of the Wittig reaction.C. The preparative possibilities of the reaction of N-phenyl-ketenylidene-triphenylphosphorane with carbon acids are presented and the synthesis of the tetramer of phenyl isonitrile is reported.D. The results of investigations into the reactions of Hexaphenylcarbodi-phosphorane are presented. © 1980 IUPAC