| Summary: | 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 <i>o</i>-[(dimethylamino)methyl]phenyl group referred to as Ar<sup>N</sup>. More specifically, we describe the synthesis of the amino stibine ligand Ph<sub>2</sub>SbAr<sup>N</sup> (<b>L</b>) and its platinum dichloride complex [<b>L</b>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 [<b>L</b>PtCl]Cl into a tricationic complex [<b>L</b>HPt(SMe<sub>2</sub>)]<sup>3+</sup> which has been isolated as a tris-triflate salt after reaction of [<b>L</b>PtCl]Cl with SMe<sub>2</sub>, HOTf and AgOTf. Finally, we show that [<b>L</b>HPt(SMe<sub>2</sub>)][OTf]<sub>3</sub> acts as a catalyst for the cyclization of 2-allyl-2-(2-propynyl)malonate.
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