title: Oxidation of Substituted Phosphanylboranes with Chalcogens.
abstract: The elemental chalcogens sulfur, selenium, tellurium and bis(trimethylsilyl)peroxide as an oxygen source are applied for the oxidation of the phosphanylboranes Ph2P-BH2⋅NMe3(1) and tBuHP-BH2⋅NMe3(2). The corresponding monooxidation products Ph2P(X)-BH2⋅NMe3(X=O-Te, 3 a-d) and tBuHP(X)-BH2⋅NMe3(X=O-Te, 4 a-d) were obtained in good yields and comprehensively characterized by single crystal X-ray structure analysis, NMR, IR spectroscopy and mass spectrometry. The first oxidation step proceeds very selectively for all chalcogenides. For the tBu derivative, a further oxidation can be realised with O2, S8and Se yielding tBu(HX)P(X)-BH2⋅NMe3(X=O, S, Se, 5 a-c). The telluride compounds presented herein are the first examples of neutral Te-substituted phosphanylboranes.
authors.affiliation: Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Marquardt
authors.affiliation: Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Hegen
authors.affiliation: Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Kahoun
authors.affiliation: Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany.
authors.forename: Manfred
authors.identifier: http://orcid.org/0000-0003-2182-5020
authors.initials: M
authors.lastname: Scheer
keywords: boron; chalcogens; oxidation; phosphanylboranes; phosphorus