Reactivity of a Cationic Phosphenium Complex of Tungsten Containing an Alkyl or a Stannyl Group

Abstract

The treatment of Cp(CO)₂MeW{PN(Me)CH₂CH₂NMe(OMe)} with BF₃OEt₂, followed by PPh₃, yields trans-[Cp(CO)₂(PPh₃)W{PN(Me)CH₂CH₂NMe(Me)}] BF₄, suggesting that a cationic phosphenium complex is first formed and then migratory insertion of the phosphenium ligand into a W-alkyl bond takes place. In the reaction of the stannyl containing complex, Cp(CO)₂(SnR₃)W{PN(Me)CH₂CH₂N-Me(OMe)}, with TMSOTf, an alkyl migration from Sn to a phosphenium P occurs to give a stannylene complex.

Keywords::

• phosphenium complex
• stannylene complex
• migaroty insertion