title: Zinc-Catalyzed Dual C-X and C-H Borylation of Aryl Halides.
abstract: A zinc-catalyzed combined C-X and C-H borylation of aryl halides using B2 pin2 (pin=OCMe2 CMe2 O) to produce the corresponding 1,2-diborylarenes under mild conditions was developed. Catalytic C-H bond activation occurs ortho to the halide groups if such a site is available or meta to the halide if the ortho position is already substituted. This method thus represents a novel use of a group XII catalyst for C-H borylation. This transformation does not proceed via a free aryne intermediate, but a radical process seems to be involved.
authors.affiliation: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany).
authors.forename: Shubhankar Kumar
authors.initials: SK
authors.lastname: Bose
authors.affiliation: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany).
authors.forename: Andrea
authors.initials: A
authors.lastname: Deißenberger
authors.affiliation: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany).
authors.forename: Antonius
authors.initials: A
authors.lastname: Eichhorn
authors.affiliation: Department of Chemistry, Durham University, South Road, Durham DH1 3LE (UK).
authors.forename: Patrick G
authors.initials: PG
authors.lastname: Steel
authors.affiliation: Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (China).
authors.forename: Zhenyang
authors.initials: Z
authors.lastname: Lin
authors.affiliation: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany). todd.marder@uni-wuerzburg.de.
authors.forename: Todd B
authors.initials: TB
authors.lastname: Marder
keywords: CH activation; boronate esters; cross-coupling; homogeneous catalysis; nitrogen heterocycles