36339-13-6Relevant articles and documents
Quinoidal tetrazines: Formation of a fascinating compound class
Bostai, Beatrix,Novaky, Zoltan,Benyei, Attila C.,Kotschy, Andras
, p. 3437 - 3439 (2007)
A series of different N-heterocyclic carbenes (NHCs) were reacted with 3,6-bis(3′,5′-dimethylpyrazolyl)-tetrazine in the presence of an inorganic carbonate to provide access to a hitherto unprecedented compound class. The formed tetrazine derivatives bearing the NHC in the 3-position and an oxygen in the 6-position show a quinoidal-like structure, according to physical examinations and X-ray crystallography.
Mechanism studies of oxidation and hydrolysis of Cu(I)–NHC and Ag–NHC in solution under air
Li, Dazhi,Ollevier, Thierry
supporting information, (2019/11/29)
The decomposition of copper(I)–NHC and silver-NHC complexes in solution under air was studied. The Cu(I)–NHCs were oxidized into urea derivatives and hydrolysed into imidazoliums or benzimidazoliums. The decomposition of Ag–NHC with a saturated backbone led to ring-opening product, while the Ag–NHC with an unsaturated backbone led to imidazolium and Ag-bisNHC complex. The effects of steric property, hydrophilicity, and binding energy of NHC to O2 and H2O on the decomposition of Cu(I)–NHC were studied using theoretical calculations. Steric hindrance played an important role on the stability of Cu(I)–NHC. Pathways for the decomposition of Cu(I)–NHC and Ag–NHC were proposed.
Cu–N-heterocyclic carbene-catalysed synthesis of 2-aryl-3-(arylethynyl)quinoxalines from one-pot tandem coupling of o-phenylenediamines and terminal alkynes
Motakatla, Venkata Krishna Reddy,Gokanapalli, Anusha,Peddiahgari, Vasu Govardhana Reddy
, (2019/09/03)
A series of new benzimidazolium chlorides bearing N,N′-benzyl, 2,4,6-trimethylbenzyl and 2,4,6-triisopropylbenzyl substituents have been designed and synthesized from various o-phenylenediamines. Subsequently, corresponding Cu-based N-heterocyclic carbenes (NHCs) were generated in situ in the reaction medium which represents a new application of NHCs exploiting distinct catalytic property towards intermolecular cyclization reaction cascade for the synthesis of 2-aryl-3-(arylethynyl)quinoxalines from o-phenylenediamines and terminal alkynes. The outcome of the cyclization reaction product depends upon the N,N′-substituents present on the benzimidazolium chlorides.