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As part of our continuing interest in the chemistry of cationic antimony Lewis acids as ligands for late transition metals, we have now investigated the synthesis of platinum complexes featuring a triarylstibine ligand substituted by an  o -[(dimethylamino)methyl]phenyl group referred to as Ar N . More specifically, we describe the synthesis of the amino stibine ligand Ph 2 SbAr N  ( L ) and its platinum dichloride complex [ L PtCl]Cl which exists as a chloride salt and which shows weak coordination of the amino group to the antimony center. We also report the conversion of [ L PtCl]Cl into a tricationic complex [ L HPt(SMe 2 )] 3+  which has been isolated as a tris-triflate salt after reaction of [ L PtCl]Cl with SMe 2 , HOTf and AgOTf. Finally, we show that [ L HPt(SMe 2 )][OTf] 3  acts as a catalyst for the cyclization of 2-allyl-2-(2-propynyl)malonate.

Structural Evidence for Pnictogen-Centered Lewis Acidity in Cationic Platinum-Stibine Complexes Featuring Pendent Amino or Ammonium Groups