title: Synthesis and Structures of cis- and trans-[Os(Bcat)(aryl)(CO)2 (PPh3 )2 ]: Compounds of Relevance to the Metal-Catalyzed Hydroboration Reaction and the Metal-Mediated Borylation of Arenes.
abstract: Support for key steps of the mechanism for the transition metal catalyzed hydroboration reaction is provided by the characterization and reactions of 1, a cis-(boryl)(aryl) complex of osmium(II). This compound readily eliminates o-tolylBcat to give the osmium(0) intermediate 2, which in the presence of HBcat reestablishes the osmium-boron bond by forming 3. R=o-tolyl, H2 cat=catechol=1,2-(HO)2 C6 H4 .
authors.affiliation: Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand, Fax: (+64) 9-373-7422.
authors.forename: C E
authors.initials: CE
authors.lastname: Rickard
authors.forename: W R
authors.initials: WR
authors.lastname: Roper
authors.forename: A
authors.initials: A
authors.lastname: Williamson
authors.forename: L J
authors.initials: LJ
authors.lastname: Wright
keywords: B ligands; Boron; Hydroborations; Osmium