Unveiling the Reactivity of Part Per Million Levels of Cobalt-Salen Complexes in Hydrosilylation of Ketones.

Autor: Latha AT; Main Group Organometallics Optoelectronic Materials and Catalysis Laboratory, Department of Chemistry, National Institute of Technology, Calicut, 673601, India., Swamy PCA; Main Group Organometallics Optoelectronic Materials and Catalysis Laboratory, Department of Chemistry, National Institute of Technology, Calicut, 673601, India.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2024 Aug 19; Vol. 30 (46), pp. e202401841. Date of Electronic Publication: 2024 Jul 29.
DOI: 10.1002/chem.202401841
Abstrakt: A series of air-stable cobalt(III)salen complexes Co-1 to Co-4 have been synthesized and employed in the hydrosilylation of ketones. Notably, the most intricately tailored Co-3 pre-catalyst exhibited exceptional catalytic activity under mild reaction conditions. The developed catalytic hydrosilylation protocol proceeded with an unusual ppm level (5 ppm) catalyst loading of Co-3 and achieved a maximum turnover number (TON) of 200,000. A wide variety of aromatic, aliphatic, and heterocyclic ketones encompassing both electron-donating and electron-withdrawing substituents were successfully transformed into the desired silyl ethers or secondary alcohols in moderate to excellent yields.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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