A Stable 1,2-Disilacyclohexene and Its 14-Electron Palladium(O) Complex

摘要

Although various types of stable disilenes have been studied extensively since the first isolation of tetramesityldisilene in 1981, cyclic disilenes are still very limited. Herein we report the synthesis of a novel type of stable six-membered cyclic disilene, the 1,2-disilacyclohexene 1 (Chart 1), using a unique reagent for introducing sterically protecting groups. The reaction of disilene 1 with bis(tricyclohexylphosphine)palladium [(Cy_3P)_2Pd] was found to afford the stable 14-electron tricoordinate disilene-palladium complex 2 having an unprecedented Y-shaped structure.