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Novel pyrazole derivative and its preparation

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专利汇可以提供Novel pyrazole derivative and its preparation专利检索,专利查询,专利分析的服务。并且NEW MATERIAL:Pyrazole derivatives of formulaI(R
1 , R
2 are hydrocarbyl or heterocyclic group that may be substituted; R
4 is H or hydrocarbyl group that may be substituted, acyl, sulfonyl that may be substituted).
EXAMPLE: 3,4-Di-t-butylthiopyrazole.
USE: Starting substance of agricultural medicines, durgs and chemicals, especially useful as intermediate with pyrazole ring for synthesizing medicines, dyes and couplers for color films.
PREPARATION: Trithiocyclopropenium salt of formula II (R
3 is hydrocarbyl or heterocyclic residue that may be substituted; X⊖ is anion) is reacted with a hydrazine of formula III to afford the objective pyrazole derivative of formulaI. The resulting compound is treated with hydrogen in the presence of a metal catalyst such as Raney nickel to eliminate -SR
1 and -SR
2 , thus leadiong to a known pyrazole derivative.
COPYRIGHT: (C)1979,JPO&Japio,下面是Novel pyrazole derivative and its preparation专利的具体信息内容。

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