发明名称 |
METHOD OF PREPARING 1-PHENYL-3-METHYL-5-PYRAZOLONE |
摘要 |
FIELD: pharmaceutical industry, more particularly, manufacture of antipyretics and chemistry of paints. SUBSTANCE: stage of condensation of phenyl hydrazine and acetoacetic acid ester and stage of cyclization of the resulting phenyl-hydrazone are combined. Reaction is carried out in aqueous medium at 50-1000 C for at least 0.5 h (40-50 min), to give product containing 98.2% main compound. Synthesis time is reduced to 0.5 h and yield is increased to 95%. EFFECT: reduced time to 0.5 h, yield is increased to 95%.
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申请公布号 |
RU2106345(C1) |
申请公布日期 |
1998.03.10 |
申请号 |
RU19940032135 |
申请日期 |
1994.09.02 |
申请人 |
AKTSIONERNOE OBSHCHESTVO OTKRYTOGO TIPA "KAUSTIK" |
发明人 |
KLIMOV S.A.;TARASOV V.F.;GORDON E.P.;SOROKINA O.V.;KLIMOV S.A.;TARASOV V.F.;GORDON E.P.;SOROKINA O.V. |
分类号 |
C07D231/26;(IPC1-7):C07D231/26 |
主分类号 |
C07D231/26 |
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