Reactivity of Pt(0) bromosilylene complexes towards ethylene

Abstract

The base-free carbazolyl bromosilylene RSiBr (R = 1,8-bis(3,5-di-tert-butyl-phenyl)-3,6-di-tert-butyl-carbazolyl) reacts with (η²-C₂H₄)Pt(PPh₃)₂ and Pt(PCy₃)₂ to form platinasilacyclobutane R(Br)Si(C₂H₄)Pt(PPh₃)₂ (1) and silylene platinum complex R(Br)SiPt(PCy₃)₂ (2), respectively. When silylene complex 2 is treated with C₂H₄, the six-membered metallasilacycle R(Br)Si(C₂H₄)₂Pt(PCy₃)₂ (3) is obtained. All compounds are characterised by XRD and multinuclear NMR spectroscopy.