METAL COMPLEX-CATALYZED REDISTRIBUTION REACTIONS OF ORGANOSILANES. IV. REDISTRIBUTION REACTIONS OF METHYLSILOXANES CATALYZED BY TRANSITION METAL COMPLEXES

Article abstract of DOI:10.1016/S0022-328X(00)86840-0

Redistribution reactions of a variety of hydrogen-substituted siloxanes are catalyzed by various transition metal complexes of iridium and rhodium.The products arise from breaking and remaking of Si-C, Si-H, and Si-O bonds.Siloxanes not possessing a Si-H bond are inert under the conditions studied.The most favored reaction pathway appears to scramble preferentially the groups directly attached to the silicon bearing the hydrogen atom.A new cyclo-iridiadisiloxane, (L = Ph3P; R = Me3SiO) is reported.This compound exists in three isomeric forms as a consequence of the spatial arrangements of the R and Me groups on the ring.