| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5ead2302413f783f81d0928441941552 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2602-08 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C315-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-673
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C319-20 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C49-733
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-67
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C49-573 |
| filingDate |
1965-06-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate |
1966-07-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
GB-1035180-A |
| titleOfInvention |
Process for the preparation of ninhydrin |
| abstract |
Ninhydrin is prepared by oxidizing 2-hydroxy 2 - methylmercaptoindan - 1,3 - dione of the formula <FORM:1035180/C2/1> with chlorine or bromine, preferably in aqueous suspension. Examples of the use of both chlorine and bromine are given. 2 - Hydroxy - 2 - methylmercaptoindan - 1,3-dione, used as starting material, is obtainable (1) by aqueous hydrolysis of 2-chloro-2-methylmercaptoindan-1,3-dione or (2) by condensing a phthalic acid diester with dimethyl sulphoxide in the presence of an alkali metal alcoholate, and rearranging the product with sulphuric acid. Examples of both these processes are given. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-108047018-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3385894-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-108047018-B |
| priorityDate |
1964-06-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |