Novel phosphaalkyne/benzoyldiazenido ligand coupling forming the first η2-phosphidocarbene complex. Synthesis and molecular structure of [ReCl2{η4-N(NCOPh)PCButPCBut}(PPh3)]

Abstract

Treatment of [ReCl₂(NNCOPh)(PPh₃)₂] with PCBu^t, in benzene, affords [ReCl₂(NNCOPh)(PCBu^t)(PPh₃)₂] and subsequently through an unprecedented phosphaalkyne/hydrazido coupling, [ReCl₂{η⁴-N(NCOPh)PCBu^tPCBu^t}(PPh₃)], the structure of which, authenticated by an X-ray diffraction analysis, contains the novel η²-phosphidocarbene ReC(Bu^t)P– fragment.