Wiley, Journal of Heterocyclic Chemistry, 5(52), p. 1346-1348, 2014
DOI: 10.1002/jhet.2172
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in Wiley Online Library (wileyonlinelibrary.com). Cyclic ketohydrazones containing α-methylene group are oxidized by chloramine-T followed by treat-ment with triethylamine leads to the formation of azoalkenes via azochloride, which are trapped by olefinic compounds to produce fused ring pyridazine derivatives in good yield.