130720-61-5Relevant academic research and scientific papers
1-arylamino-1H-imidazoles by "oxidative reduction" - Conversion of 1-arylamino-2,3-dihydro-1H-Imidazole-2-thiones
Schantl, Joachim G.,Lagoja, Irene M.
, p. 929 - 938 (1998)
Desulfurization of the thione function of N-arylthiosemicarbazides incorporated in a heterocyclic ring was achieved with 30 % hydrogen peroxide in acetic acid. This reagent proved superior for the title transformation of thiones (1) into 2-unsubstituted 1
1,2,3-Triazolium-1-oxide, -1-imide and 1-methanide Hetero-1,3,5-triene Equilibrium: Ab Initio Calculations. A New Base Induced Ring Expansion of 1-Alkyl-1,2,3-triazolium Salts to 2,3-Dihydro-1,2,4-triazines and 1-Amino-imidazoles via the 1,2,5-Triazahexa-1,3,5-triene System. Azolium 1,3-
Butler, Richard N.,Duffy, J. Paul,Cunningham, Desmond,McArdle, Patrick,Burke, Luke A.
, p. 147 - 152 (2007/10/02)
Treatment of substituted 1-methyl- and 1-trimethylsilylmethyl-1,2,3-triazolium salts with ethoxide and caesium fluoride respectively gave substituted 2,3-dihydro-1,2,4-triazines and 1-aminoimidazoles via 1,2,5-triazahexa-1,3,5-triene intermediates.Expected isomeric 1,2,3-triazolium-1-methanide 1,3-dipoles were not detected and ab initio calculations suggested that they are thermodynamically unfavoured.Ab initio calculations on the equilibrium between the acyclic hetero-1,3,5-triene system and the cyclic forms of 1,2,3-triazolium-1-oxide, -1-imide and -1-methanide are reported.X-ray crystal structures are described for 2,5,6-triphenyl-2,3-dihydro-1,2,4-triazine 6a and 1-(p-nitroanilino)-4,5-diphenylimidazole 11c.
Attempted Generation of Substituted 1,2,3-Triazolium-1-methanides: a New Ring Expansion to 2,3-Dihydro-1,2,4-triazines: ab initio Calculations on 1,2,3-Triazolium-1-oxide, -1-imide, and -1-methanide 1,3-Dipoles and a Striking Illustration of the Hammond Principle in the Cyclisation of H.
Butler, Richard N.,Duffy, J. Paul,Cunningham, D.,McArdle, P.,Burke, Luke A.
, p. 882 - 884 (2007/10/02)
Treatment of 1-methyl-1,2,3-triazolium salts with ethoxide gave 2,3-dihydro-1,2,4-triazines via 1,2,5-triazahexa-1,3,5-trienes but the expected 1,2,3-triazolium-1-methanide 1,3-dipoles were not detected and ab initio calculations suggest that they are thermodynamically unfavoured; the X-ray crystal structure of (6a), a dihydro-1,2,4-triazine, is reported.
