S(N<i>t</i>Bu): A Dianion Isoelectronic to SO and the Related MeS(N<i>t</i>Bu)

Abstract

The nitrogen analogue of the sulfate ion, tetraimidosulfate S(NR) is easily accessible from S(NR)3 and LiN(H)R. S(NR)3 can be prepared from S(NR)2 and LiN(H)R by oxidation of the resulting [Li2(NR)3S]2 with bormine or iodine. In an addition reaction organolithium compounds and S(NR)3 yield the related triimidosulfonate RS(NR). Both anions form molecular contact ion pairs with lithium cations (structure of S(NR) shown on the right, the thf ligands on Li1 and Li2 have been omitted), which makes them promising ligands in coordination chemistry.