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