title: Synthesis, characterisation and reactions of phosphine-substituted alkynylboronates and alkynyltrifluoroborate salts.
abstract: The synthesis and structural characterisation of phosphine-substituted alkynylboronates is reported. A P(III)-centred alkynylboronate (2) was prepared that showed little evidence for the conjugation of the P-lone pair to the boron via the alkyne π-system, as judged by X-ray crystallography studies of 2 and a related P(V) compound, 3. In addition, corresponding alkynyltrifluoroborate salts were prepared that showed improved stability by comparison to their boronic ester counterparts. These salts undergo Pd-catalysed cross-coupling reactions with aryl halides.
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK. vivat.jerome@gmail.com.
authors.forename: Jérôme F
authors.initials: JF
authors.lastname: Vivat
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK. s.bachollet@sheffield.ac.uk.
authors.forename: Sylvestre P J T
authors.initials: SP
authors.lastname: Bachollet
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK. h.adams@shef.ac.uk.
authors.forename: Harry
authors.initials: H
authors.lastname: Adams
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK. j.harrity@sheffield.ac.uk.
authors.forename: Joseph P A
authors.initials: JP
authors.lastname: Harrity
mesh_terms: D001897:Boronic Acids / Q000138:chemical synthesis*; D018360:Crystallography, X-Ray; D010720:Phosphines / Q000138:chemical synthesis*; D012492:Salts
chemical_list: D001897:Boronic Acids; D010720:Phosphines; D012492:Salts