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- W2034357154 abstract "Various 1H,6H-pyrano[2,3-c]pyrazol-6-ones (III-XXIII) were obtained from β-keto esters and 1H-pyrazol-5-ones or hydrazines. Nitrations, chlorinations and brominations of these pyranopyrazoles were also carried out giving the corresponding derivatives (XXIV-LXIV). The pyrone ring is the more reactive one in these reactions and the preferred position of attack is the 5-position. The substitution products are formed by the addition-elimination route." @default.
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- W2034357154 date "1982-09-01" @default.
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- W2034357154 title "Pyranopyrazoles. II. Synthesis and reactions of 1<i>H</i>,6<i>H</i>-pyrano[2,3-c]pyrazol-6-ones" @default.
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- W2034357154 doi "https://doi.org/10.1002/jhet.5570190520" @default.
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