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- W2135497796 abstract "Bis-hydrazonoyl chloride 1 reacts regioselectively with 3-mercapto-1,2,4-triazole 2a, 2,3-dihydro-3-thioxo-1,2,4-triazin-5(4H)-one 2b and 2-mercaptobenzimidazole 2c to give the hitherto unknown annelated 2,3-bis-(phenylhydrazono)thiazoles 6a-c, respectively. Reactions of 1 with the methylthio derivatives of such heterocycles afforded the annelated 3,3′-bis-(1,2,4-triazoles) 11a-c, respectively. Similar reaction of 1 with 2-phenylamino-4(3H)-pyrimidinones 4 gave 2,3-bis(phenylhydrazono)imidazo[1,2-a]pyrimidin-5(1H)-ones 16. Oxidation of 6c yielded the corresponding bis(phenylazo) derivative 15. The regiochemistry of the studied reactions is discussed." @default.
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- W2135497796 date "2002-12-01" @default.
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- W2135497796 title "Regioselectivity in Reactions of Bis-Hydrazonoyl Halides with Some Bifunctional Heterocycles" @default.
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