http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-2138882-C
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f73ee334cfffc55441bb644d648faf17 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_fe6fe660b51f186b8332614263fb8ae2 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2601-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07B2200-09 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C403-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-5435 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-56 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C57-03 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C403-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C403-20 |
| filingDate | 1994-12-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2006-10-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_34aaf5376456e12396e1f98b18f82b45 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f31b7c89f29321de8ea71a2aada3eab6 |
| publicationDate | 2006-10-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-2138882-C |
| titleOfInvention | The preparation of 9-(z)-retinoic acid |
| abstract | A process for preparing 9-(Z)-retinoic acid from mother liquors from the industrial preparation of C15-triarylphosphonium salts of the general formula I See Formula I where R1 to R3 are each aryl and X.THETA. is halogen or (HSO4).THETA., in an organic solvent, which comprises A. increasing the proportion of 9-(Z)-C15-triarylphosphonium salt in the C15-triarylphosphonium salts isolated from the mother liquor by treatment with isopropanol at elevated temperature, cooling and separating off the all-(E)-C15-triarylphosphonium salt which has crystallized out, B. subjecting the resulting C15-triarylphosphonium salt to a Wittig reaction with an alkyl .beta.-formylcrotonate of the general formula See Formula II and C. hydrolyzing the resulting oily retinoic ester mixture in a C3-C9-alkanol, preferably in a propanol or butanol, precipitating the resulting 9-(Z)-retinoic acid where appropriate by other adding methanol as crystals, with all-(E)-retinoic acid and retinoic acid isomers remaining in the alkanolic solution. |
| priorityDate | 1993-12-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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Total number of triples: 66.