Abstract
Herein we report the reduction of R-EX2 (E= P, Sb) with two equiv. of KC8 in the presence of silylene (LSiR; L=PhC(NtBu)2) to give Trip-P=SiL(C6H4PPh2) (1), TerPh-P=(tBu)SiL (2) and TerPh-Sb=(tBu)SiL (3). The last (3) belongs to a new class of heavier analogues of Schiff bases (>C=N-), containing a formal >Si=Sb- double bond. The theoretical calculations suggest that lone pairs on the dicoordinated group-15 centers are stabilized by hyperconjugative interactions resulting in pseudo-Si-P/Si-Sb multiple bonds which are highly reactive as indicated by the high first and second proton affinities.
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