发明名称 |
Process for the production of thiophenes from alpha-methylene ketones in the single-stage process and new ortho-fused thiophenes produced by means of the process |
摘要 |
Described is a novel process which can be carried out as a single-stage synthesis for the production of substituted and/or b,d- ortho-fused thiophenes. Serving as starting compounds and alpha -methylene ketones which are reacted in an preferably alcoholic solvent with bromine whereafter the formed intermediate product after separation from the solvent is reacted directly with a sulphurising agent. Preferably under reflux conditions in a suitable solvent to form the end product. In this way also hitherto unknown ortho-fused thiophene compounds are synthesized more especially those with 5 or 9 rings condensed with one another.
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申请公布号 |
US4876361(A) |
申请公布日期 |
1989.10.24 |
申请号 |
US19870129701 |
申请日期 |
1987.12.07 |
申请人 |
VON DER HAAR-CZOGALLA, RITA |
发明人 |
CZOGALLA, CLAUS-D. |
分类号 |
C07D333/04;A01N43/12;C07D333/08;C07D333/50;C07D333/78;C07D495/14;C08K5/45;C09K15/12;C10M133/34;C10N30/10 |
主分类号 |
C07D333/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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