Structural Evidence for Pnictogen-Centered Lewis Acidity in Cationic Platinum-Stibine Complexes Featuring Pendent Amino or Ammonium Groups |
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Authors: | Roberta R Rodrigues Franois P Gabbaï |
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Institution: | Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA; |
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Abstract: | 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 ArN. More specifically, we describe the synthesis of the amino stibine ligand Ph2SbArN (L) and its platinum dichloride complex LPtCl]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 LPtCl]Cl into a tricationic complex LHPt(SMe2)]3+ which has been isolated as a tris-triflate salt after reaction of LPtCl]Cl with SMe2, HOTf and AgOTf. Finally, we show that LHPt(SMe2)]OTf]3 acts as a catalyst for the cyclization of 2-allyl-2-(2-propynyl)malonate. |
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Keywords: | pnictogen bonding platinum catalysis |
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