http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H03246244-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_25cabd848a625c278d0f654e54a2f0c0 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-05 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-78 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C39-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C39-27 |
| filingDate | 1990-02-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5fc2643ba9e5a3a8502b530566d9546b |
| publicationDate | 1991-11-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-H03246244-A |
| titleOfInvention | Production of fluorophenols |
| abstract | PURPOSE: To advantageously obtain the subject compounds which are intermediates for medicines and agricultural chemicals without any problems such as polymerization or waste water by diazotizing fluoroanilines, then hydrolyzing the resultant compound with a heated aqueous solution of sulfuric acid at a concentration within a specific range, subjecting the product to azeotropic distillation with water and subsequently separating the prepared compound from the reaction system. n CONSTITUTION: Fluoroanilines expressed by formula I (R 1 , R 2 and R 3 are H, halogen or alkyl, provided that at least one or more of the R 1 , R 2 and R 3 indicate F) are used as a raw material and diazotized in a dilute sulfuric acid. The sulfuric acid is used in an amount of preferably 1-1.2 equiv. based on the compounds expressed by formula I. Sodium nitrite is used as a diazotizing agent and the diazotization is preferably carried out at 0-10°C. The resultant diazonium salt is then dripped into a heated sulfuric acid solution while keeping the concentration of the sulfuric acid within a range thereof (preferably 55-70% concentration) such that the hydrolytic reaction may be sufficiently advanced. The resultant compounds expressed by formula II are separated and obtained by carrying out azeotropic distillation with water. n COPYRIGHT: (C)1991,JPO&Japio |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5892126-A |
| priorityDate | 1990-02-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 24.