title: Scope and mechanism of the Pt-catalyzed enantioselective diboration of monosubstituted alkenes.
abstract: The Pt-catalyzed enantioselective diboration of terminal alkenes can be accomplished in an enantioselective fashion in the presence of chiral phosphonite ligands. Optimal procedures and the substrate scope of this transformation are fully investigated. Reaction progress kinetic analysis and kinetic isotope effects suggest that the stereodefining step in the catalytic cycle is olefin migratory insertion into a Pt-B bond. Density functional theory analysis, combined with other experimental data, suggests that the insertion reaction positions platinum at the internal carbon of the substrate. A stereochemical model for this reaction is advanced that is in line both with these features and with the crystal structure of a Pt-ligand complex.
authors.affiliation: Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA..
authors.forename: John R
authors.initials: JR
authors.lastname: Coombs
authors.forename: Fredrik
authors.initials: F
authors.lastname: Haeffner
authors.forename: Laura T
authors.initials: LT
authors.lastname: Kliman
authors.forename: James P
authors.initials: JP
authors.lastname: Morken
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D001881:Borates / Q000737:chemistry*; D002384:Catalysis; D007700:Kinetics; D008024:Ligands; D008958:Models, Molecular; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D010984:Platinum / Q000737:chemistry*; D013237:Stereoisomerism; D013379:Substrate Specificity
chemical_list: D000475:Alkenes; D001881:Borates; D008024:Ligands; D010984:Platinum