Stiba-, Arsa- and Phosphastannenes: Syntheses and Reactivities.

A facile synthesis for unprecedented stibastannene (10) featuring a Sn=Sb-double bond together with the homologous arsa- (9) and phosphastannenes (8) is presented. Chloride abstraction from respective stannyl pnictinidenes [E=P (5), As (6), Sb (7)], which were made accessible by reduction of ECl addition products at an intramolecular phosphine-stabilized stannylene, gave the pnictastannenes in moderate yields. The pnictastannenes coordinate Pd(PPh ) fragments (12-14) and the phosphastannene forms also a nickel coordination compound with the Ni(PPh ) -fragment (11).