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Pyrazoline derivatives and their preparation

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专利汇可以提供Pyrazoline derivatives and their preparation专利检索,专利查询,专利分析的服务。并且NEW MATERIAL:Pryazoline derivatives of formulas I, II, and III: (R
1 is methyl or phenyl group; R
2 is H, 1W10C alkyl, or aralkyl group; R
3 is H, 1W4C alkyl, or alkenyl group), which are tautomers.
EXAMPLE: 1-Thio carbomoyl-3-methylpyrazoline-5-one.
USE: Aricultural and horticultural fungicides, having a wide range of antibacterial activity on agriculatural and horticultural pathogenic fungi, particularly effective for blast of rice plants powdery meldew and anthracnose of cucumbers.
PROCESS: A β-keto-acid ester of formula IV: (Z is OC
2 H
5 ) or a β-keto-acid amide (Z is NH
2 , NHCH
3 , etc.) is reacted with a thiosemicarbazide of formula V under acidic conditions to form the compound of formula I, II or III. Alternatively, the compound of formula IV is reacted with the compound of formula V under neutral or weakly acidic conditions to give a β-keto-acid ester thiosemicarbazone, which is reacted under strongly acidic conditions.
COPYRIGHT: (C)1979,JPO&Japio,下面是Pyrazoline derivatives and their preparation专利的具体信息内容。

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