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1-methyl-5-hydroxypyrazole-4-carboxylic lower alkyl ester and its preparation

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专利汇可以提供1-methyl-5-hydroxypyrazole-4-carboxylic lower alkyl ester and its preparation专利检索,专利查询,专利分析的服务。并且NEW MATERIAL:A compound of formula I (R
1 is lower alkyl).
EXAMPLE: Ethyl 1-methyl-5-hydroxypyrazole-4-carboxylate.
USE: Farm chemical, especially a starting material of 1-methyl-5-hydroxypyrazole used as an intermediate of an active ingredient of herbicide.
PREPARATION: The reaction between 0.1W10mol of lower alkoxymethylenemalonic lower alkyl ester of formula II (R
2 is same as R
1 ) and 1mol of methylhydrazine of formula III is carried out, preferably in a solvent, at low temperatures at the start of the reaction, by heating the mixture as the reaction approaches the completion to effect the cyclization into the compound of formula I .
COPYRIGHT: (C)1983,JPO&Japio,下面是1-methyl-5-hydroxypyrazole-4-carboxylic lower alkyl ester and its preparation专利的具体信息内容。

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