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- W2027034265 abstract "3-Phenylpyrazole-5-(liazonium chloride (1) couples with α-chloro derivatives of acetylacetone, ethyl acetoacetate and aceto-o-anisidine to yield the corresponding pyrazole-5-yl hydrazonyl chloride derivatives 2a-c. Compounds 2a,b were cyclised to yield either the pyrazolo[1,5-c]-1,2,4-triazole derivatives 3a,b or the pyrazolo[1,5-c]-as-triazines 4a,b depending on the applied reaction conditions. Compound 2c cyclised only into 3c under different cyclization conditions. The pyrazolo[1,5-c]-as-triazine derivatives 4c-e could be prepared via condensation of 2a with potassium cyanide. Compound 2d reacted with aromatic thioles and with sodium benzene-sulphonate to yield the pyrazolo[1,5-c]-as-triazine derivatives 6a-d. Compound 1 reacted with activated double bond systems to yield pyrazolo[1,5-c]-as-triazines 8a,b and 9." @default.
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- W2027034265 date "1977-04-01" @default.
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- W2027034265 title "Reactions with heterocyclic diazonium salts: New routes for the synthesis of pyrazolo[1,5-<i>c</i>]-1,2,4-triazoles and pyrazolo[1,5-<i>c</i>]-as-triazines" @default.
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- W2027034265 doi "https://doi.org/10.1002/jhet.5570140212" @default.
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