On the Dual Role of N-Heterocyclic Carbenes as Bases and Nucleophiles in Reactions with Organic Halides
作者:Axel Jacobi von Wangelin、Christiane Knappke、Anthony Arduengo, III、Haijun Jiao、Jörg-Martin Neudörfl
DOI:10.1055/s-0031-1289593
日期:2011.12
nucleophilicities, and sterics of N-heterocyclic carbenes have been studied in reactions of imidazolin-2-ylidenes with organic halides. Highly nucleophilic and less basic carbenes cleanly gave alkylideneimidazolines, the deoxy analogues of Breslow-type intermediates. More basic NHCs engaged in unwanted deprotonation or dehydrohalogenation reactions. N-heterocyclic carbenes - enamines - umpolung - imidazoles - nucleophilicity