http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H03232828-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_4da8f51531e628ab8522fd85b02b7376 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C17-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C25-13 |
| filingDate | 1990-02-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8cfb7c4bf9f283054043056afc0fdc45 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_92d510a9e900f5b9710e51894036fa9f |
| publicationDate | 1991-10-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-H03232828-A |
| titleOfInvention | Production of 1,2-difluorobenzene |
| abstract | PURPOSE: To obtain the subject substance in high yield by diazotizing 2- fluoroaniline, converting to a borofluoride and thermally decomposing the resultant 2-fluorobenzene diazonium tetrafluoroborate in a polychlorinated aromatic solvent. n CONSTITUTION: 2-Fluoroaniline is diazotized with sodium nitrite, etc., in the presence of a mineral acid, the precipitated inorganic salt is removed by filtration and the product is made to react with hydroborofluoric acid to obtain 2-fluorobenzene diazonium tetrafluoroborate in the form of slurry. The slurry is filtered and the obtained powder is mixed with 0.5-10 times weight of a polychlorinated aromatic solvent (e.g. 1,2-dichlorobenzene) without drying. The mixture is heated at ≤90°C under reduced pressure to distill off water. When the system is returned to normal pressure, the decomposition takes place at about 155°C and the distilled and purified subject substance is continuously taken out of the system. The compound is useful as an intermediate raw material for pharmaceuticals, agricultural chemicals liquid crystal materials, etc. n COPYRIGHT: (C)1991,JPO&Japio |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-114874067-A |
| priorityDate | 1990-02-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 27.