Dicationic Sulfur Analogues of N-Heterocyclic Silylenes and Phosphenium Cations


  • We are very grateful to Natural Sciences and Engineering Research Council of Canada, the Canada Foundation for Innovation, Ontario Ministry of Research and Innovation, and UWO for generous financial support. We also thank J. L. Dutton for assistance with X-ray crystallographic studies and V.H. for useful discussion.


DABling with sulfur: Sulfur(II) dications can be prepared using α-diimines to stabilize the positive charge (see scheme; DAB=diazabutadiene, Dipp=2,6-diisopropylphenyl, OTf=CF3SO3). The bonding is best described as that of a N,N-chelated sulfur(II) dication; these species represent the first sulfur-based structural mimics of N-heterocyclic silylene compounds and phosphenium cations.

original image