Mechanistic insights and comparative analysis of Ru(ii)–NNC pincer complexes with anionic-, protic-, and classical-NHCs for transfer hydrogenation of ketones

Abstract

A series of Ru(ii)–NNC pincer-type complexes bearing anionic-, protic- and classical-NHC ligands are reported. Comparative analysis of catalytic activity in transfer hydrogenation of ketones is investigated both experimentally and computationally.

Protic- or anionic-NHCs with a classical-NHC in a single [Ru(CNC)(PPh3)2Cl]Cl pincer complex: direct comparison of structure & electronic properties and heterolytic H2 splitting

“…18 There are a few reports where a comparison between protic- and classical-NHCs has been made mainly based on catalytic activity. 19,20 For the structural comparison, two different molecules containing a protic- or classical-NHC ligand have generally been considered. These molecules may crystallise into different space groups or have different lattice parameters, thereby not giving a clear picture for direct comparison.…”