Publications by authors named "Jean-Charles Bruyere"
Article Synopsis
- The study explores the reactivity of zinc dialkyl species with a specific type of carbene, leading to the creation of stable zinc Lewis acidic compounds.
- The research details the formation and instability of an intermediate zinc-carbene adduct that participates in several subsequent reactions, resulting in various reactive zinc species.
- Results show that these zinc compounds exhibit strong Lewis acidity, making them effective catalysts for hydrosilylation processes, similar to N-heterocyclic carbene equivalents.
Tri-organyl and tricoordinate N-heterocyclic carbene (NHC) Zn-NHC alkyl cations [(nNHC) Zn-Me] (nNHC=C2-bonded-IMes/-IDipp; 3 and 4 ; IMes=1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene, IDipp=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) were first synthesized and structurally characterized by ionization of the corresponding neutral precursors [(nNHC)ZnMe ] with [Ph C][B(C F ) ] in the presence of one equivalent of free NHC. Whereas cation [(nIMes) Zn-Me] (3 ) is stable, its sterically congested analogue [(nIDipp) Zn-Me] (4 ) readily undergoes an nNHC-to-aNHC isomerization in the presence of THF or IDipp to afford the more thermodynamically stable [(aIDipp)(nIDipp)Zn-Me] (aIDipp=C4-bonded IDipp, 5 ), reflecting the adaptable-to-sterics coordination chemistry of these cations for improved stability. Cations 3 -5 are the first Zn cations of the type Zn(C)(C')(C'') (C, C', C''=σ-donor carbyl ligand).
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