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Updated: Jul 2, 2026

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
Unprecedented long-range 1,7-bromination in gold complexes of N-(aryl)imino functionalized N-heterocyclic carbenes
Manoja K Samantaray1, Keliang Pang, Mobin M Shaikh
1Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076, India.
Abstract:
An unique long-range 1,7-bromination reaction is observed in gold(III) complexes of N-(aryl)imino functionalized N-heterocyclic carbene with the bromination occurring at two different carbon (sp2 and sp3) centers spatially separated by ca. 6.4 A but existing in extended conjugation to each other. In particular, the unusual distant 1,7-brominated gold(III) complexes [1-R-3-{N-(p-bromo-2,6-di-i-propylphenylimino)-2-phenyl-1-bromoethyl}imidazol-2-ylidene]AuBr3 [R = Me (1d), i-Pr (2d), t-Bu (3d), -CH2Ph (4d)] were synthesized cleanly at room temperature under ambient conditions from the reactions of molecular bromine with the gold(I) complexes [1-R-3-{N-(2,6-di-i-propylphenylimino)-2-phenylethyl}imidazol-2-ylidene]AuCl [R = Me (1c), i-Pr (2c), t-Bu (3c), -CH2Ph (4c)]. All of the 1,7-bromination products (1d, 2d, 3d and 4d) have been structurally verified by X-ray diffraction studies.
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