title: Two contrasting ethynyl hydroboration pathways in the formation of a novel tris-hydroboration product from reaction of dimesitylborane with 2,5-diethynylpyridine.
abstract: Reaction of 2,5-diethynylpyridine with dimesitylborane, [(Mes)(2)BH](2)(Mes = mesityl = 2,4,6-Me(3)C(6)H(2)), gave the unexpected tris-hydroboration product 1-[(Mes)(2)B]-2-[Z-1-[(Mes)(2)B]ethylidene]-5-[E-[(Mes)(2)B]vinyl]-1,2-dihydropyridine, which has been structurally characterised by single-crystal X-ray diffraction.
authors.affiliation: Department of Chemistry, University of Durham, South Road, Durham, UK DH1 3LE.
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Entwistle
authors.forename: Andrei S
authors.initials: AS
authors.lastname: Batsanov
authors.forename: Judith A K
authors.initials: JA
authors.lastname: Howard
authors.forename: Mark A
authors.initials: MA
authors.lastname: Fox
authors.forename: Todd B
authors.initials: TB
authors.lastname: Marder