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Aluminum Amidinates: Insights into Alkyne Hydroboration.

Hobson, K; Carmalt, CJ; Bakewell, C; (2021) Aluminum Amidinates: Insights into Alkyne Hydroboration. Inorganic Chemistry 10.1021/acs.inorgchem.1c00619. (In press). Green open access

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Abstract

The mechanism of the aluminum-mediated hydroboration of terminal alkynes was investigated using a series of novel aluminum amidinate hydride and alkyl complexes bearing symmetric and asymmetric ligands. The new aluminum complexes were fully characterized and found to facilitate the formation of the (E)-vinylboronate hydroboration product, with rates and orders of reaction linked to complex size and stability. Kinetic analysis and stoichiometric reactions were used to elucidate the mechanism, which we propose to proceed via the initial formation of an Al-borane adduct. Additionally, the most unstable complex was found to promote decomposition of the pinacolborane substrate to borane (BH3), which can then proceed to catalyze the reaction. This mechanism is in contrast to previously reported aluminum hydride-catalyzed hydroboration reactions, which are proposed to proceed via the initial formation of an aluminum acetylide, or by hydroalumination to form a vinylboronate ester as the first step in the catalytic cycle.

Type: Article
Title: Aluminum Amidinates: Insights into Alkyne Hydroboration.
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.inorgchem.1c00619
Publisher version: http://dx.doi.org/10.1021/acs.inorgchem.1c00619
Language: English
Additional information: © 2021 The Authors. Published by American Chemical Society. This is an open access article under the CC BY 4.0 license Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/)
Keywords: Hydrocarbons, Anions, Ligands, Aluminum, Chemical reactions
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10131532
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