title: Direct hydroboration of B=B bonds: a mild strategy for the proliferation of B-B bonds.
abstract: Synthetic access to electron-precise boron chains is hampered by the preferential formation of nonclassical structures. The few existing strategies for this involve either strongly reducing reagents or transition-metal catalysts, both with distinct disadvantages. The synthesis of new furyl- and thienyl-substituted diborenes is presented, along with their direct hydroboration with catecholborane (CatBH) to form a new electron-precise B-B bond and a B3 chain. The reaction is diastereoselective and proceeds under mild conditions without the use of strong reducing agents or transition-metal catalysts commonly used in B-B coupling reactions.
authors.affiliation: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/. h.braunschweig@uni-wuerzburg.de.
authors.forename: Holger
authors.initials: H
authors.lastname: Braunschweig
authors.forename: Rian D
authors.initials: RD
authors.lastname: Dewhurst
authors.forename: Christian
authors.initials: C
authors.lastname: Hörl
authors.forename: Ashwini K
authors.initials: AK
authors.lastname: Phukan
authors.forename: Florian
authors.initials: F
authors.lastname: Pinzner
authors.forename: Stefan
authors.initials: S
authors.lastname: Ullrich
keywords: diborenes; hydroboration; oxygen heterocycles; polyboranes; sulfur heterocycles