Iridium complexes with silyl ligands

Iridium complexes with O-donor ligand environments, Ir(triso)(ol)2 [triso = tris(diphenyloxophosphoranyl)methanide ol = C2H4, cyclooc-tene), catalyze the hydrosilylation and dehydrogenative silylation of ethylene with triphenylsilane.35 Diphenylmethylsilane can also be used in the... 

The iridium complex [lr(OMe)(cod)2] with 4,4 -di-tert-butyl-2,2 -bipyridine (dtbpy) or 2,9-diisopropyl-l,10-phenanthroline (dipphen) as ligand shows a catalytic activity for aromatic C—H silylation of aromatic compounds by disilane [60]. The reac-hon of 1,2-dimethylbenzene 135 with l,2-di-tert-butyl-l,l,2,2,-tetrafluorodisilane... 

Detailed mechanistic studies with respect to the application of Speier s catalyst on the hydrosilylation of ethylene showed that the process proceeds according to the Chalk-Harrod mechanism and the rate-determining step is the isomerization of Pt(silyl)(alkyl) complex formed by the ethylene insertion into the Pt—H bond.613 In contrast to the platinum-catalyzed hydrosilylation, the complexes of the iron and cobalt triads (iron, ruthenium, osmium and cobalt, rhodium, iridium, respectively) catalyze dehydrogenative silylation competitively with hydrosilylation. Dehydrogenative silylation occurs via the formation of a complex with cr-alkyl and a-silylalkyl ligands ... 

Trls(diphenylthiophosphinoyl)nethanide (C(P(S)Ph2)3 ) complexes of rhodium and Iridium have been prepared and the crystal structure of the iridium complex [Ir(co) 2 T)2-C(P(S)Ph2> 3-S,S ] reveals a bidentate S,S ligand-iridium interaction. The trihydride complex [IrHa(CO)(dppe)] reacts with primary, secondary, and tertiary silanes to yield mono- and bis(silyl)hydride complexes of the formulae [IrH2(SiRR 2) (CO)(dppe)] and [IrH(SiRR 2)2(CO)(dppe)] (SiRR 2 = SiPhs,... 

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