FIELD: organic chemistry.
SUBSTANCE: claimed method includes dissolving of isomer mixture in low boiling solvent wherein both isomers have high solubility at any temperature. High boiling solvent wherein 4,4'-isomer has have low solubility both at room temperature and at solvent boiling point, and 2,4'-isomer has high solubility at boiling point and low one at room temperature is added to obtained mixture. After distilling of low boiling solvent 4,4'-isomer forms suspension in high boiling solvent which is separated by hot filtration. Filtrate is cooled and 2,4'-isomer is isolated from suspension at room temperature. Obtained compounds have purity of 95-97 % and are useful in synthesis of high molecular substances, photoconductors, etc.
EFFECT: method of high yield.
5 cl, 5 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF SYNTHESIS OF 2,2-BIS-[4-(3,4-DICARBOXYPHENOXY)-PHENYL]-PROPANE BIS-IMIDE | 1992 |
|
RU2036906C1 |
| METHOD FOR PRODUCTION OF 2-HYDROXYBENZALDEHYDE | 1992 |
|
RU2065849C1 |
| PROCESS FOR PREPARATION OF HERBICIDAL CARBOXYLIC ACID SALTS | 2014 |
|
RU2664642C2 |
| METHOD OF PRODUCING 21,4,41 -TRINITROBENZANILIDE | 2007 |
|
RU2394810C2 |
| METHOD FOR PROCESSING OF HIGH-BOILING BY-PRODUCTS OF TRIMETHYLPROPANE PRODUCTION PROCESS | 2016 |
|
RU2616004C1 |
| 0 |
|
SU366615A1 | |
| METHOD OF OBTAINING 21,4,41-TRINITROBENZANILIDE | 2006 |
|
RU2348612C2 |
| METHOD FOR PRODUCING METHYLENE DIPHENYL DIISOCYANATE | 2020 |
|
RU2750198C1 |
| OXAZOLIDINE DERIVATIVES OR THEIR PHARMACEUTICALLY ACCEPTABLE SALTS OR ESTERS AND METHOD OF THEIR SYNTHESIS | 1993 |
|
RU2090564C1 |
| METHOD FOR PREPARING 5(6)-AMINO-2-(4'-AMINOPHENYL)-BENZIMIDAZOLE | 2005 |
|
RU2283307C1 |
