Gold (I) α‐Trifluoromethyl Carbenes: Synthesis, Characterization and Reactivity Studies

M Rigoulet, D Vesseur, K Miqueu… - Angewandte Chemie …, 2022 - Wiley Online Library
Angewandte Chemie International Edition, 2022Wiley Online Library
Aryl trifluoromethyl diazomethanes 2‐R (R= Ph, OMe, CF3) are readily decomposed by the
(o‐carboranyl) diphosphine gold (I) complex 1. The resulting α‐CF3 substituted carbene
complexes 3‐R have been characterized by multi‐nuclear NMR spectroscopy as well as X‐
ray crystallography (for 3‐Ph). The bonding situation was thoroughly assessed by
computational means, showing stabilization of the electrophilic carbene center by π‐
donation from the aryl substituent and backdonation from Au, as enhanced by the chelating …
Abstract
Aryl trifluoromethyl diazomethanes 2‐R (R=Ph, OMe, CF3) are readily decomposed by the (o‐carboranyl)diphosphine gold(I) complex 1. The resulting α‐CF3 substituted carbene complexes 3‐R have been characterized by multi‐nuclear NMR spectroscopy as well as X‐ray crystallography (for 3‐Ph). The bonding situation was thoroughly assessed by computational means, showing stabilization of the electrophilic carbene center by π‐donation from the aryl substituent and backdonation from Au, as enhanced by the chelating P^P ligand. Reactivity studies under stoichiometric and catalytic conditions substantiate typical carbene‐type behavior for 3‐Ph.
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