| Original document(9 pages) Authorized document(4 pages) 中文版 |
The invention uses sulfur as substitute for noble metal palladium in dehydrogenation to prepare pyrazole. The process, using chlorobenzene as solvent in prepn. of the diazole cpds. (original solvent is a mixture of xylylene and dichloroethane), can reduce one solvent and lower the amt. of used solvent. The invention adoptes a new complete way by using methyl-hydrazine as starting material until to obtain 1-methyl-3.5-di-phenyl-methyl-pyrazoline, and then catalytic dehydrogenation by transition metal halides to prepare pyrazole. The process has short step and high yields which can reach 70% from acetophenone to diazole cpds. |
Application Number
申请号 |
85108315 |
Application Date
申请日 |
1985.11.07 |
| Title 名称 |
Improved synthesis of diazole compounds |
Publication Number
公开号 |
1010934 |
Publication Date
公开日 |
1987.05.13 |
| Approval Pub. Date |
|
Granted Pub. Date |
1991.10.02 |
| International Classification 分类号 |
A01N43/56,C07D231/12 |
Applicant(s) Name
申请人 |
Xibei Univ. |
| Address 地址 |
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| Inventor(s) Name 发明人 |
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| Attorney & Agent 代理人 |
TIAN GUIXIAN LI MINGZHI |
| More information 更 多 信 息 |
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