TRANSITION-METAL SILYL COMPLEXES .47. DIP ROTONATION OF ELECTRON-RICHHYDRIDO-SILYL COMPLEXES FE(CO)2(DPPE)(H)(SIR3) AND FE(CO)(DPPE)H3(SIR3) - FORMATION OF THE COMPLEXES FE(CO)2(DPPE)(EME3)(SIR3) AND FE(CO)(DPPE)H2(EME3)(SIR3) (E = SN, PB) FROM THE CORRESPONDING ANIONIC COMPLEXES

The hydridosilyl complexes Fe(CO)2(dppe)(H)[Si(OR)3](R = Me, Et) and F e(CO)(dppe)H3[Si(OEt)3](dppe = Ph2PCH2CH2PPh2) were deprotonated with KH/18-crown-6 to give the anionic silyl complexes [K(18-crown-6)][Fe(C O)2(dppe){Si(OR)3}] (2) and [K(18-crown-6)] [Fe(CO)(dppe)H2{Si(OEt)3}] (4), respectively. Reaction of 2 with Me3ECl (E = Sn or Pb) affords t he octahedral complexes Fe(CO)2(dppe)(EMe3)[Si(OR)3] with trans-CO lig ands. From 4 and Me3ECl the complexes Fe(CO)(dppe)H2(EMe3)[Si(OEt)3] a re formed. Spectroscopic data suggest that those complexes have a capp ed octahedral geometry, in which the dppe ligand, ER3 and CO are in pl ane, one hydride ligand is in an axial position and the other hydride caps a triangular face.