Martin Caleb D, Jennings Michael C, Ferguson Michael J, Ragogna Paul J
Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, ON, N6A 5B7, Canada.
Angew Chem Int Ed Engl. 2009;48(12):2210-3. doi: 10.1002/anie.200805198.
DABling with sulfur: Sulfur(II) dications can be prepared using alpha-diimines to stabilize the positive charge (see scheme; DAB = diazabutadiene, Dipp = 2,6-diisopropylphenyl, OTf = CF(3)SO(3)). 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.
