Half-sandwich ruthenium-carbene catalysts: Synthesis, characterization, and catalytic application in the N-alkylation of amines with alcohols
INORGANICA CHIMICA ACTA, vol.498, 2019 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 498
- Publication Date: 2019
- Doi Number: 10.1016/j.ica.2019.119163
- Journal Name: INORGANICA CHIMICA ACTA
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Keywords: N-Heterocyclic carbene, Ruthenium, N-Alkylation of amines, Hydrogen-borrowing process, BORROWING HYDROGEN, HETEROCYCLIC CARBENE, TERTIARY-AMINES, BOND ACTIVATION, AMIDE SYNTHESIS, AMINATION, COMPLEXES, EFFICIENT, IRIDIUM, SULFONAMIDES
- Inonu University Affiliated: Yes
Abstract
In this study, the synthesis and characterization of new half-sandwich ruthenium complexes containing oxygen functionalised N-aryl and N-alkyl benzimidazol-2-ylidene ligands have been reported. All ruthenium complexes were tested as catalysts for a wide range of substrates in the N-alkylation of secondary cyclic amines such as pyrrolidine and piperidine, and 4-methylaniline which was a primary aromatic amine with alcohols by hydrogen-borrowing process. The catalytic reactions were performed with 1 mol% catalyst loading at 120 degrees C, 16 h under solvent-free conditions. All ruthenium complexes showed excellent catalytic activity, and N-alkylated products were obtained selectively.