| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2601-16 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C403-12 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C1-34
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C403-20
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C403-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-293 |
| filingDate |
2004-12-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f76a309bb9ef8a646a0822c9b40218c5
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2a30c909e5bdc4798bf27adc4643fa5b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ca6d448fe4bbf0e920baa16aa802e048
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_659f7ac8d8617b4bc3dba4a1a3b55b9b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0ad154f8f556ac1cbe5e02f3ccffb9ca |
| publicationDate |
2006-09-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-1697317-A1 |
| titleOfInvention |
Method for producing vitamin a acetate |
| abstract |
The invention relates to a method for producing vitamin A acetate by reacting beta -vinyl ionol with triphenylphosphine in the presence of sulphuric acid in a solvent mixture consisting of between 60 and 80 % methanol, between 10 and 20 % water and between 10 and 20 wt. % aliphatic, cyclic or aromatic hydrocarbons with between 5 and 8 atoms, in order to obtain beta -ionylidene ethyltriphenyl phosphonium salts and then by a subsequent Wittig reaction using 4-acetoxy-2-methyl-but-2-enal. |
| priorityDate |
2003-12-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |