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- W1982093768 abstract "1-Arylimino-pyrazole Betaines, Pyrazoles and 1,2,4-Triazines from 3-Arylazo-propenoic Acid N-Chloramides Reaction of 3-arylazo-propenoic acid amides 5 with NaOCl yields N-chloroamides 6 which give under alkaline conditions 1,2,4-triazines 9 and 10 (products of a Hofmann degradation). This reaction competes with an intramolecular electrophilic amination and a 1,2-shift reaction giving 1-arylimino-pyrazole betaines 11 and 4-chloroimino-pyrazolones 13. Exchange of the halogen in 11 with nucleophiles leads to further betaines 12. Bis-pyrazole 14 and 1,2,3-triazoles 15 are available from 13b. The X-ray structure analysis of compound 11b is discussed." @default.
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- W1982093768 date "1993-01-01" @default.
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- W1982093768 title "1-Arylimino-pyrazol-Betaine, Pyrazole und 1,2,4-Triazine aus 3-Arylazo-propens�ure-N-chloroamiden" @default.
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- W1982093768 doi "https://doi.org/10.1002/prac.19933350707" @default.
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