P4 activation

An Isolable 2,5-Disila-3,4-Diphosphapyrrole and a Conjugated Si=P−Si=P−Si=N Chain Through Degradation of White Phosphorus with a N,N-Bis(Silylenyl)Aniline

Submitted by Jun Zhu on Thu, 08/11/2022 - 10:08

White phosphorus (P4) undergoes degradation to P2 moieties if exposed to the new N,N-bis(silylenyl)aniline PhNSi2 1 (Si=Si[N(tBu)]2CPh), furnishing the first isolable 2,5-disila-3,4-diphosphapyrrole 2 and the two novel functionalized Si=P doubly bonded compounds 3 and 4. The pathways for the transformation of the non-aromatic 2,5-disila-3,4-diphosphapyrrole PhNSi2P2 2 into 3 and 4 could be uncovered.

Unexpected White Phosphorus (P4) Activation Modes with Silylene-Substituted o-Carboranes and Access to an Isolable 1,3-Diphospha-2,4-disilabutadiene

Submitted by Jun Zhu on Fri, 05/06/2022 - 22:15

New types of metal-free white phosphorus (P4) activation are reported. While the phosphine-silylene-substituted dicarborane 1, CB-SiP {CB = ortho-C,C´-C2B10H10, Si = PhC(tBuN)2Si, P = P[N(tBu)CH2]2}, activates white phosphorus in a 2:1 molar ratio to yield the P5-chain containing species 2, the analogous bis(silylene)-substituted compound 3, CB-Si2, reacts with P4 in the molar ratio of 2:1 to furnish the first isolable 1,3-diphospha-2,4-disilabutadiene (Si=P-Si=P-containing) compound 4.