An unprecedented 1,4-diphospha-2,3-disila butadiene (–P[double bond, length as m-dash]Si–Si[double bond, length as m-dash]P–) derivative and a 1,3-diphospha-2-silaallyl anion, each stabilized by the amidinate ligand ligand

The first acyclic 4p-electron –PQSi–SiQP– motif with two four coordinate silicon substituents supported by the amidinate ligand and two coordinate phosphorus has been synthesized fromthe reaction of heteroleptic chlorosilylene LSiCl (1), TripPCl2 (Trip = 2,4,6-iPr3C6H2) and KC8 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. peerReviewed