Electronically tuneable orthometalated Ru^II–NHC complexes as efficient catalysts for C–C and C–N bond formations via borrowing hydrogen strategy

Abstract

A series of simple and electronically tuneable cyclometalated RuII–NHC complexes have been explored as efficient catalysts for various C–C/N bond forming reactions via a BH methodology.

Towards new coordination modes of 1,2,3-triazolylidene: controlled by the nature of the 1st metalation in a heteroditopic bis-NHC ligand

“…3 Along with the very common Arduengo type imidazolylidenes, triazole derived 1,2,4-triazolylidenes have also been widely utilized for various applications. 4 After Bertrand's early discovery of 1,2,4-triazol-3,5-diylidene supported organometallic polymer, 5 the Peris group successfully utilized this bis-NHC system to access diverse homo- as well as heterometallic complexes. 3 c ,6 Later in 2008, the group of Albrecht introduced 1,2,3-triazolylidenes into the NHC family as an abnormal congener (mesoionic carbenes, MICs) of normal NHCs.…”

Progressive study on ruthenium catalysis for de(hydrogenative) alkylation and alkenylation using alcohols as a sustainable source

“…Recently, Rit and his group 51 prepared different cyclometalated Ru( ii )-NHC complexes to demonstrate the catalytic activity of this type of reaction (Scheme 35). With 0.01 mol% catalyst loading and 10 mol% KOH (w.r.t both alcohols), the Ru-34 complex bearing a 1,2,4-triazolylidene donor with a 4-NO 2 phenyl group showed the maximum activity for this coupling reaction.…”

N-Heterocyclic Carbene-Supported Nickel-Catalyzed Selective (Un)Symmetrical N-Alkylation of Aromatic Diamines with Alcohols

“…Thus, the development of more efficient and atom-economical methodologies utilizing renewable and nontoxic starting materials for the construction of the C–N bond is now a trending goal in sustainable chemistry. In this context, the utilization of alcohols as alkylating agents has gained special recognition in view of their sustainable behavior as they are readily available from lignocellulosic biomass and various industrial methods . Typically, an alcohol functionality first needs to be converted into a better leaving group such as mesylates, triflates, tosylates, halides, and so forth (due to the poor electrophilic nature and leaving ability of a hydroxyl group) and then reacted with a suitable amine compound for an N-alkylation reaction .…”