89522-08-7Relevant academic research and scientific papers
Sythesis of trifluoromethyltriazoles from Trifluoroacetohydrazonoyl Bromide
Tanaka, Kiyoshi,Honda, Osamu,Minoguchi, Kazumi,Mitsuhashi, Keiryo
, p. 1391 - 1396 (2007/10/02)
N-Phenyltrifluoroacetohydrazonoyl bromide (1) reacted with potassium isothiocyanate and isocyanate to give 5-imino-4-phenyl-2-trifluoromethyl-Δ2-1,3,4-thiadiazoline and 1-phenyl-3-trifluoromethyl-Δ2-1,2,4-triazolin-5-one, respectively.On treatment with several types of cumulative double bonds such as alkyl isothiocyanate, isocyanate, and carbodiimide, 1 afforded regioselectively the corresponding trifluoromethylthiadiazoline, -oxadiazoline, and -triazoline, respectively.These cycloadducts were assumed to form through the stepwise path involving the addition of 1 toward the cumulative double bond followed by the intramolecular cyclization.Concerning cyanamides, the corresponding triazoles were obtained and the reactions with pyridines afforded the triazolopyridinium bromides.The reactivity of the latter was found to depend on the substituents on the pyridine nucleus.
Synthesis of 1-Aryl-3-trifluoromethyl-5-methylthio-1,2,4-triazoles From 2-Arylmethylisothiosemicarbazides and 1,1,1-Trichloro-3,3,3-trifluoroacetone
Pilgram, Kurt H.,Skiles, Richard D.
, p. 1533 - 1537 (2007/10/02)
The reaction of 1,1,1-trichloro-3,3,3-trifluoroacetone with S-methyl-2-arylthiosemicarbazides affords an unusual synthesis of 1-aryl-3-trifluoromethyl-5-methylthio-1,2,4-triazoles from which 1-aryl-3-trifluoromethyl-1,2,4(4H)-triazole-5-ones are obtained on treatment with base.
