http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0569823-A2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C229-62 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C227-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C227-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C227-18 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C227-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C227-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J31-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C227-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C229-62 |
| filingDate | 1993-05-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_74185e5161a93d96952dc90a3640ebec |
| publicationDate | 1993-11-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-0569823-A2 |
| titleOfInvention | Process for the preparation of 2,5-di-phenylamino terephthalic acid and its dialkyl esters |
| abstract | The present invention relates to a process for the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters of the general formula in which R represents a hydrogen atom or a methyl or an ethyl group, by reacting a dialkyl succinate with sodium alcoholate in xylene, treating the 2,5-dihydroxycyclohexadiene-dicarboxylic acid (1,4) dialkyl ester formed with acid and aniline, Dehydrogenation of the 2,5-di-phenylamino-dihydro- (3,6) -terephthalic acid dialkyl ester formed by means of oxygen, optionally saponification of the 2,5-di-phenylamino-terephthalic acid dialkyl ester formed and release of the 2,5-di-phenylamino-terephthalic acid from the formed disodium salt. The dialkyl 2,5-di-phenylamino-dihydro- (3,6) -terephthalate is reacted with pure oxygen in the presence of an alkali metal ion and / or an alkaline earth metal ion. This significantly reduces unwanted contamination. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8809583-B2 |
| priorityDate | 1992-05-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 109.