http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5110952-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b4956374e238689b820a3469ca82b9e0 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B11-24 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D493-10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B67-48 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D493-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B11-28 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09B11-24 |
| filingDate | 1990-12-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1992-05-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5522e5a9238528ca5f49401a3382b5df http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b3ba57a1c190822f5697df74ff7b0fc5 |
| publicationDate | 1992-05-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-5110952-A |
| titleOfInvention | Method of producing 3-dibutylamino 6-methyl-7-anilinofluoran |
| abstract | A method of producing a high melting point 3-dibutyl amino-6-methyl-7-anilinofluoran characterized by peaks at diffraction angle (2 θ) of 6.9°, 11.0°, 18.5° and 18.9° in X-ray diffractiometry using Cu-K α ray and having a melting point in the range of 179°-186° C., which comprises: condensing 2-(4-dibutylamino-2-hydroxy-benzoyl) benzoic acid with 4-methoxy-2-methyldiphenylamine in the presence of concentrated sulfuric acid to provide a phthalide at a temperature in the range of 0°-50° C., neutralizing the phthalide, and then subjecting the phthalide to ring closure reaction using an alkali in an amount of 0.5-15 mols per mol of the compound used in smaller amounts of 2-(4-dibutylamino-2-hydroxy-benzoyl) benzoic acid and 4-methoxy-2-methyldiphenylamine at a temperature of not less than 50° C. in the presence or absence of an organic solvent. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-101190920-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5300473-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-1854201-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5210221-A |
| priorityDate | 1989-12-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 61.