| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e559abcd8f120b071dc1162360867ffa
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_8c8dbcf50fe783c0e155cbd9cc1d92c5 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-76
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-74 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-76 |
| filingDate |
2003-04-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2009-02-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1a51fc48e594e68daf4af8da48266312
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d40a6a0aa70c542b35c0c0435ac8d884
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_abbb22d3c863d69359c21004d7b8717d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ca99d762d7968d02b438faf1a21c9ec9
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_65b9f4e33262a7bb94adf066629b4d38 |
| publicationDate |
2009-02-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-7491834-B2 |
| titleOfInvention |
Chemical process |
| abstract |
3-Isochromanone is prepared by partially chlorinating o-tolylacetic acid with sulphuryl chloride or chlorine gas in an inert organic solvent in the presence of a free radical initiator. The 2-chloromethylphenylacetic acid first obtained is converted to 3-isochromanone by treatment with a base and separated from unreacted o-tolylacetic acid, which is in the form of a salt, by a phase separation technique. The separated o-tolylacetic acid salt is converted to o-tolylacetic acid by controlled acidification and the o-tolylacetic acid is extracted for re-use. The invention reduces the formation of unwanted, over-chlorinated by-products and leads to a more efficient process. |
| priorityDate |
2002-05-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |