EA201400241A1 - METHOD FOR OBTAINING 5-AMINO-2- (4-AMINOPHENYL) -1H-BENZIMIDAZOLE - Google Patents
METHOD FOR OBTAINING 5-AMINO-2- (4-AMINOPHENYL) -1H-BENZIMIDAZOLEInfo
- Publication number
- EA201400241A1 EA201400241A1 EA201400241A EA201400241A EA201400241A1 EA 201400241 A1 EA201400241 A1 EA 201400241A1 EA 201400241 A EA201400241 A EA 201400241A EA 201400241 A EA201400241 A EA 201400241A EA 201400241 A1 EA201400241 A1 EA 201400241A1
- Authority
- EA
- Eurasian Patent Office
- Prior art keywords
- dabi
- aminophenyl
- benzimidazole
- amino
- isolated
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
Abstract
Изобретение относится к области органической химии и касается способа получения 5-амино-2-(4-аминофенил)-1Н-бензимидазола (ДАБИ), который находит применение в производстве волокнообразующих полимеров со специальными характеристиками, например, для производства параамидных высокопрочных термостойких волокон. Предложен способ получения ДАБИ, характеризующийся тем, что 2',4',4-триаминобензанилид подвергают циклодегидратации при 90-110°С в присутствии муравьиной кислоты или ее соли первоначально в среде разбавленного раствора соляной кислоты, полученную солянокислую соль ДАБИ выделяют путем введения концентрированной соляной кислоты, обрабатывают активированным углем в водном растворе при 90-110°С и рН среды 0,5-3,0, целевой продукт выделяют нейтрализацией газообразным аммиаком или аммиачной водой. Предложенным способом получают продукт с содержанием основного вещества не менее 99,2 мас.%.The invention relates to the field of organic chemistry and relates to a method for producing 5-amino-2- (4-aminophenyl) -1H-benzimidazole (DABI), which is used in the production of fiber-forming polymers with special characteristics, for example, for the production of para-amide high-strength heat-resistant fibers. A method of obtaining DABI, characterized by the fact that 2 ', 4', 4-diaminobenzanilide is subjected to cyclodehydration at 90-110 ° C in the presence of formic acid or its salt, initially in a dilute hydrochloric acid solution, the resulting hydrochloric acid salt of DABI is isolated by introducing concentrated hydrochloric acids, treated with activated carbon in an aqueous solution at 90-110 ° C and a pH of 0.5-3.0, the target product is isolated by neutralization with gaseous ammonia or ammonia water. The proposed method receive a product with a content of the basic substance of not less than 99.2 wt.%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EA201400241A EA024484B1 (en) | 2014-03-17 | 2014-03-17 | Process for preparing 5-amino-2-(4-aminophenyl)-1h-benzimidazole |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EA201400241A EA024484B1 (en) | 2014-03-17 | 2014-03-17 | Process for preparing 5-amino-2-(4-aminophenyl)-1h-benzimidazole |
Publications (2)
Publication Number | Publication Date |
---|---|
EA201400241A1 true EA201400241A1 (en) | 2015-09-30 |
EA024484B1 EA024484B1 (en) | 2016-09-30 |
Family
ID=54198830
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EA201400241A EA024484B1 (en) | 2014-03-17 | 2014-03-17 | Process for preparing 5-amino-2-(4-aminophenyl)-1h-benzimidazole |
Country Status (1)
Country | Link |
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EA (1) | EA024484B1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4109093A (en) * | 1975-01-14 | 1978-08-22 | Produits Chimiques Ugine Kuhlmann | Process for making 2-(4'-aminophenyl) 5-amino benzimidazole |
RU1438178C (en) * | 1986-03-17 | 1995-07-25 | Чебоксарское производственное объединение "Химпром" | Method of synthesis of 5(6)-amino-2-(4'-aminophenyl)benzimidazole |
RU2283307C1 (en) * | 2005-07-18 | 2006-09-10 | Открытое акционерное общество "Каменскволокно" (ОАО "Каменскволокно") | Method for preparing 5(6)-amino-2-(4'-aminophenyl)-benzimidazole |
RU2345988C2 (en) * | 2006-06-30 | 2009-02-10 | Евгений Львович Вулах | Method of obtaining 5(6)-amino-2-(4-aminophenyl) benzimidazole |
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2014
- 2014-03-17 EA EA201400241A patent/EA024484B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EA024484B1 (en) | 2016-09-30 |
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Legal Events
Date | Code | Title | Description |
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MM4A | Lapse of a eurasian patent due to non-payment of renewal fees within the time limit in the following designated state(s) |
Designated state(s): AM KG TJ TM |