Related Experiment Video
Updated: Feb 24, 2026

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
Heteroleptic nickel(ii)-diNHC complexes and an unusual 'reverse' carbene-transfer reaction to silver(i)
Han Vinh Huynh1, Christine Hui Min Koh1, Van Ha Nguyen1
1Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore. chmhhv@nus.edu.sg.
Abstract:
A series of rare [NiX2(MeCCprop)] complexes bearing the cis-chelating benzimidazole-derived dicarbene ligand MeCCprop and varying anionic coligands (2, X = N3; 3, X = NCS; 4, X = I; 5, X = O2CCF3) have been prepared and coligand dependent structural and spectroscopic features have been evaluated. This study also revealed an unusual 'reverse' carbene transfer reaction from nickel to silver giving the disilver species [Ag2X2(μ-κ2-MeCCprop)] (6, X = OAc; 7, X = O2CCF3). A preliminary catalytic study of two representative NiII diNHC complexes in the aqueous and phosphine-free Suzuki-Miyaura coupling reaction of aryl halides is reported as well. These reactions provide good yields of coupling products, but do not require inert conditions.
More Related Videos
Related Concept Videos
Formation of Complex Ions
Catalysis
Complexation Equilibria: The Chelate Effect
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview
Diels–Alder Reaction: Characteristics of Dienes
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable,...
Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

