Preparation method of 5-aminobenzimidazole

A technology of aminobenzimidazole and nitrobenzimidazolone is applied in the field of preparation of 5-aminobenzimidazole, can solve the problems of troublesome post-processing, less equipment investment, large environmental pollution and the like, and achieves less side reactions and higher quality Good, high-yield effect
CN102002002AInactive Publication Date: 2011-04-06张家港市蓝迪森新材料科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
张家港市蓝迪森新材料科技有限公司
Publication Date
2011-04-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of 5-aminobenzimidazole, which comprises the following steps: 1) synthesis of 2,4-dinitroaniline; 2) synthesis of 4-nitro-1,2-phenylenediamine; 3) synthesis of 5-nitro benzimidazolone; and 4) hydrogenation reduction of the 5-nitro benzimidazolone. The preparation method of the 5-nitro benzimidazolone is a catalytic hydrogenation reducing process which has completed reaction and less side reaction, does not have pollution on the environment, and the product generated by the method has high quality and high yield, and is suitable for industrialized production.
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Description

technical field

[0001] The invention belongs to the field of organic synthesis, and in particular relates to a preparation method of 5-aminobenzimidazole. Background technique

[0002] Benzimidazolone organic pigments belong to azo pigments in chemical classification, but their application performance and fastness are not comparable to other azo pigments. Benzimidazolone organic pigments get their name from the 5-amidobenzimidazolone group in the molecule.

[0003] The benzimidazolone structure of the cyclic amido group (-NHCONH-) in the pigment molecule increases the polarity of the molecule and can form hydrogen bonds, which changes the aggregation state of the molecule, making the pigment have a higher melting point and can significantly reduce The solubility in the solvent makes the pigment have light fastness, weather fastness, solvent resistance, migration resistance and heat resistance stability. Because the color of benzimidazolone organic pigments is very strong, ...

Claims

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