The silicon-boron bond of (dimethylphenylsilyl)pinacolborane was stereosele
ctively added to acyclic 1,3-dienes in a 1,4-fashion to give (Z)4-boryl-1 -
silyl-2-alkene derivatives in the presence of a Ni(0) catalyst generated fr
om Ni(acac)(2) and diisobutylaluminum hydride, 1,4-Silaboration of cyclic 1
,3-dienes required the use of cyclohexyldiphenylphosphine with the Ni(0) ca
talyst to afford cis-1-boryl-1-silyl-2-cycloalkene derivatives in high yiel
ds with high stereoselectivities.