α,α-dibromoketones as useful precursors in organic synthesis: A simple and efficient synthesis of 2,4-diaryl- 1,2,3-triazoles via oxidative cyclization of bisphenylhydrazones
α,α-Dibromoacetophenones (1a-1f) on reaction with phenylhydrazine afford corresponding arylglyoxal bisphenylhydrazones (2a-2f). The oxidation of bishydrazones 2a-2f by using copper(II) chloride in acetic acid leads to intramolecular cyclization with the formation of 2,4-diaryl-1,2,3-triazoles (3a-3f). The method for the conversion 1 → 3 has been simplified by developing one-pot procedure without isolation of intermediates 2.
Arora, Loveena,Sharma, Nisha,Kapoor, Jitander K.
p. 291 - 296
(2019/01/18)
Studies on Heterocyclic Compounds. XX. The Reaction of the Oxazolopyridazinium Perchlorates with Hydrazines
On treatment with hydrazine hydrate (80 percent) and methylhydrazine, oxazolopyridazinium perchlorates (I) furnish hemi-perchlorates of 4H-pyridazinotriazines (VI) and 1-methyl-4H-pyridazinotriazinium perchlorates (VIII)
Satoh, Kazue,Miyasaka, Tadashi,Arakawa, Kiichi
p. 1557 - 1566
(2007/10/02)
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