1. Cationic platinum(II) - or palladium(II)-carbyl complexes and unsaturated substrates: a facile way to C-C bond formation
- Author
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Francesco Ruffo, Diego Tesauro, Maria Elena Cucciolito, Vicenzo De Felice, Augusto De Renzi, Vicenzo De, Felice, Cucciolito, MARIA ELENA, Augusto De, Renzi, Ruffo, Francesco, and Tesauro, Diego
- Subjects
chemistry.chemical_classification ,PLATINUM ,Denticity ,Alkene ,Ligand ,Organic Chemistry ,Cationic polymerization ,CARBON LIGANDS ,chemistry.chemical_element ,Photochemistry ,Biochemistry ,Medicinal chemistry ,Inorganic Chemistry ,Propene ,Metal ,chemistry.chemical_compound ,chemistry ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,C-C BOND FORMATION ,Physical and Theoretical Chemistry ,5-COORDINATE OLEFIN COMPLEXES ,Platinum ,Palladium - Abstract
Alkenes, alkynes, 1,2- and 1,3-dienes react with [MR(N-N)(MeCN)] + (M = Pt or Pd; R = hydrocarbyl group; NN = bidentate nitrogen ligand) to give R-substituted derivatives. The organic fragment is generally retained within the metal environment in η 1 or η 3 coordination, except in the reaction of alkenes with Pd (II) complexes. In this case, a free R-substituted alkene is produced via a relatively fast β-elimination process from a Pd-alkyl intermediate. Different regiochemistries are detected in the reaction between monosubstituted olefins (propene or styrene) and homologous Pt and Pd complexes. The Pt-C bond is always formed with the terminal unsubstituted alkene carbon, while a preference toward the internal carbon, particularly if phenyl-substituted, is observed with Pd species. Neutral [MClR(N-N)] are markedly less reactive. In this case, when M = Pt, the unsaturated organic substrate generally adds to the metal affording fairly stable tbp five-coordinate complexes.