A new mechanism for metal-catalyzed stannane dehydrocoupling based on alpha-H-elimination in a hafnium hydrostannyl complex.
The hafnium hydrostannyl complex CpCpHf(SnHMes(2))Cl (Cp = eta(5)-C(5)Me(5)) has been synthesized from the reaction of CpCpHf(H)Cl with Mes(2)SnH(2). This compound has been identified as an intermediate in the metal-catalyzed dehydrocoupling of Mes(2)SnH(2) to the distannane Mes(2)HSnSnHMes(2) (Mes = 2,4,6-trimethylphenyl). The dehydrocoupling in this system appears to occur by elimination of :SnMes(2) from CpCpHf(SnHMes(2))Cl, with Sn-Sn bond formation proceeding via insertion of the stannylene into a Sn-H bond.
Neale
Nathan R
NR
Department of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, USA.
Tilley
T Don
TD