title: Diverse Activation Modes in the Hydroboration of Aldehydes and Ketones with Germanium, Tin, and Lead Lewis Pairs.
abstract: Intramolecular germylene, stannylene, and plumbylene Lewis pairs were reacted with hexanal and yielded the cyclic addition products only with the germanium and tin reagents. In further reactivity studies, the hydroboration of aldehydes and ketones catalyzed by intramolecular germylene, stannylene, and plumbylene Lewis pairs was studied. In the case of the cyclic germylene Lewis pair, the product of the oxidative addition of pinacolborane at the germylene moiety was observed. According to stoichiometric as well as catalytic experiments, the intramolecular germylene Lewis pair acts as a catalyst in the hydroboration of aldehydes and ketones. The homologous stannylene Lewis pair forms a reactive tin hydride during the catalysis, which can also act as a catalyst in this transformation.
authors.affiliation: Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany.
authors.forename: Julia
authors.initials: J
authors.lastname: Schneider
authors.affiliation: Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany.
authors.forename: Christian P
authors.initials: CP
authors.lastname: Sindlinger
authors.affiliation: Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany.
authors.forename: Sarah M
authors.initials: SM
authors.lastname: Freitag
authors.affiliation: Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany.
authors.forename: Hartmut
authors.initials: H
authors.lastname: Schubert
authors.affiliation: Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany.
authors.forename: Lars
authors.identifier: 0000-0003-4701-4410
authors.initials: L
authors.lastname: Wesemann
keywords: Lewis pairs; germylenes; hydroboration; main-group catalysis; stannylenes