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Article Dans Une Revue European Journal of Inorganic Chemistry Année : 2024

Stoichiometric and Catalytic Reduction of Carbon Dioxide by a Sterically Encumbered Amidinato Magnesium Hydride

Résumé

A sterically encumbered dinuclear amidinato magnesium hydride 3 with bridging hydrido ligands was synthesized from the metalation of the corresponding amidine 1 with dibutylmagnesium and subsequent treatment with phenylsilane. This complex reacts stoichiometrically with 1 atm of carbon dioxide at room temperature in tetrahydrofuran (THF) to the corresponding bis(thf) adduct of the dinuclear formate complex 4-2 thf with bridging formate anions. This complex is stable in THF at 60 °C for more than 16 hours but decomposes into the amidine 1 upon removal of ligated thf ligands. Complex 3 efficiently catalyzes the reduction of carbon dioxide with 9-BBN, yielding bis(boryl)acetal (R2BO)2CH2, and with silanes H4-nSiPhn (n=1, 2, and 3). The bis(silyl)acetal is quantitatively accessible for Ph3SiH (n=3) whereas during the reduction of CO2 with hydrogen-richer silanes (n=1, 2) siloxanes form and methane evolves.
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hal-04632394 , version 1 (02-07-2024)

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Wimonsiri Huadsai, Laure Vendier, Helmar M Görls, Lionel Magna, Sébastien Bontemps, et al.. Stoichiometric and Catalytic Reduction of Carbon Dioxide by a Sterically Encumbered Amidinato Magnesium Hydride. European Journal of Inorganic Chemistry, In press, pp.e202400128. ⟨10.1002/ejic.202400128⟩. ⟨hal-04632394⟩
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