An unprecedented 1,4-diphospha-2,3-disila butadiene (–PSi–SiP–) derivative and a 1,3-diphospha-2-silaallyl anion, each stabilized by the amidinate ligand

The synthesis of a 1,4-bisphosphino-2,3-disila butadiene and a 1,3-diphospha-2-silaallyl anion has been reported.

The first acyclic 4π-electron –PSi–SiP– motif with two four coordinate silicon substituents supported by the amidinate ligand and two coordinate phosphorus has been synthesized from the reaction of heteroleptic chlorosilylene LSiCl (1), TripPCl 2 (Trip = 2,4,6- i Pr 3 C 6 H 2 ) and KC 8 in a 1 : 1 : 3 ratio. The same reaction in a 1 : 2 : 6 ratio in the presence of one equivalent of 18-crown-6 ether affords the 1,3-diphospha-2-silaallyl anion.