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Hydroboration of carbon dioxide with catechol- and pinacolborane using an Ir–CNP* pincer complex. Water influence on the catalytic activity

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Abstract

Iridium complexes based on deprotonated lutidine-derived CNP* pincers 2a/2b selectively catalyzed the hydroboration of CO2 under mild conditions (1–2 bar CO2, 30 °C) to methoxyborane using HBcat (TOF up to 56 h−1) and to the formate level with HBpin (TOF up to 1245 h−1). Interestingly, an intriguing, positive water effect on the reaction rates has been observed. NMR spectroscopy and ESI-MS analysis of the hydroboration reactions have shown the formation of ligand-protonated [Ir(CNP)(CO)(BR2)H][B(R2)2] (R2 = catecholate, pinacolate) derivatives under catalytic conditions. Control experiments, however, have demonstrated that these derivatives are not catalytically competent species in the hydroboration of CO2.

Graphical abstract: Hydroboration of carbon dioxide with catechol- and pinacolborane using an Ir–CNP* pincer complex. Water influence on the catalytic activity

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Publication details

The article was received on 01 Oct 2018, accepted on 26 Oct 2018 and first published on 29 Oct 2018


Article type: Paper
DOI: 10.1039/C8DT03951H
Citation: Dalton Trans., 2018, Advance Article
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    Hydroboration of carbon dioxide with catechol- and pinacolborane using an Ir–CNP* pincer complex. Water influence on the catalytic activity

    P. Sánchez, M. Hernández-Juárez, N. Rendón, J. López-Serrano, E. Álvarez, M. Paneque and A. Suárez, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT03951H

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