| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b4956374e238689b820a3469ca82b9e0 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D493-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09B11-24 |
| 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 |
1990-12-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8f2258132181098f8ee307622054458f
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_18cead98db736cb41a630d4bc0353468 |
| publicationDate |
1991-07-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-0435149-A2 |
| titleOfInvention |
Method of producing 3-dibutylamino-6-methyl-7-anilinofluoran |
| abstract |
A method of producing a high melting point 3-dibutylamino-6-methyl-7-anilinofluoran characterized by peaks at diffraction angle (2ϑ) of 6.9°,11.0°, 18.5° and 18.9° in X-ray diffractiometry using Cu-Kα 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-hydroxybenzoyl)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/EP-0526856-A2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0526856-A3
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0928794-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6071853-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5438032-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5166350-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5342967-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0546577-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5338866-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5376617-A |
| priorityDate |
1989-12-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |