Spontaneous N-2-diboranylation of [W(N-2)(2)(dppe)(2)] with B2Br4(SMe2)(2)

The 1,3-bromoboration of [W(N-2)(2)(dppe)(2)] (dppe = 1,2-bis(diphenylphosphino)ethane) with B2Br4(SMe2)(2) in the presence of various Lewis bases L yields diboranyldiazenido complexes, with L coordinating either at the terminal or internal boron atom. The 2 : 1 reaction of [W(N-2)(2)(dppe)(2)] and B2Br4(SMe2)(2) yields a 1,2-bis(diazenido)diborane-bridged ditungsten complex with a fully planar pi-conjugated BrWN2B2Br2N2WBr core.