Synthesis and coordination chemistry of 1,3,5-triphosphabicyclo[2.1.0]- pent-2-ene

Abstract

Room temperature electrocyclisation of the 1,2,4-triphosphole P₃C₂Bu^t₂CH(SiMe₃)₂ affords the new 1,3,5-triphosphabicyclo[2.1.0]pent-2-ene which undergoes a very rapid [1,3]-phosphorus migration which can be stopped by coordination of [W(CO)₅]; the two isomeric phosphorus compounds react differently with [PtCl₂(PEt₃)]₂, the latter via an insertion of the metal into the P–P bond and a chlorine migration reaction to afford trans-[PtCl(PEt₃)P₂C₂- Bu^t₂PClCH(SiMe₃)₂], the molecular structure of which has been determined by a single crystal X-ray diffraction study.