Oxidative addition to a monomeric stannylene to give four-coordinate tin compounds containing the bulky bidentate ligand C(SiMe3)2SiMe2CH2CH2Me2Si(Me3Si)2C. Crystal structures of CH2Me2Si(Me3Si)2CSnC(SiMe3)2SiMe2CH2, CH2Me2Si(Me3Si)2CSnMe(OCOCF3)C(SiMe3)2SiMe2CH2, and (CF3COO)2MeSnC(SiMe3)2SiMe2CH2CH2Me2Si- (Me3Si)2CSnMe(OCOCF3)2

Reaction of (THF)2KRRK(THF)2 (RR = C(SiMe3)2SiMe2CH2CH2Me2Si(Me3Si)2C) with SnCl2 in Et2O gave a mixture of the cyclic and linear SnII compounds RSnR 4, and ClSnRRSnCl, 9. This mixture was treated with MeI to give the corresponding SnIV compounds 5, and IClMeSnRRSnMeClI, 10. Treatment of RSnMeIR 5 and 10 with AgO2CCF3 gave the corresponding trifluoroacetates 6 and 11, which were structurally characterized.