| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-72
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J27-138 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-72
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J27-138 |
| filingDate |
1997-12-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0ad154f8f556ac1cbe5e02f3ccffb9ca
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5c8a76d2ecb592fe28c8d046ed6aa8bd
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_71d917ef6d5ad128ed5b9652f4be747b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4ab863633224a3a33549b4f556def828
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_be87dbeb8b46b517a86c8da0475fe711
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6288c3c81c34548ec74378613cce113d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_614b02700589c22120b01b6e89895398 |
| publicationDate |
1998-07-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-0850937-A1 |
| titleOfInvention |
Process for the preparation of alpha-tocopherol or alpha-tocopheryl acetate by reacting trimethylhydroquinone and phytol or isophytol and recycling the zinc halogenide condensation catalyst |
| abstract |
A. die Umsetzung in einem mit Wasser nicht oder nur wenig mischbarennunpolaren Lösungsmittel durchführt, und B. das benötigte Zinkhalogenid in Form einer Mischung aus 1 bisn4 mol Wasser pro mol Zinkhalogenid in die Umsetzung einbringt. A process for the preparation of α-tocopherol or α-tocopheryl acetate by reacting 2,3,5-trimethylhydroquinone with isophytol or phytol in the presence of a zinc halide condensation catalyst and a proton donor in a solvent and optionally subsequent esterification with acetic anhydride, which is characterized in that is that one A. the reaction is carried out in a water-immiscible or only slightly miscible non-polar solvent, and B. introduces the required zinc halide in the form of a mixture of 1 to 4 mol of water per mol of zinc halide into the reaction. n n n The possibility of the required zinc halide in the inventionnProcess in the form of a manageable at 50 to 200 ° C.nand easily metered mixture of zinc halide and water withoutnDeterioration of the yield and purity of the tocopherolnBeing able to contribute opens the way to an advantageous onenReturn of the zinc halide after the reaction by separationnor extracting and recycling the zinc halide in the form of an60 to 90 wt .-% solution or pumpable mash. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-0242286-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-0017185-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6784303-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-03011850-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-1094935-C
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1132385-A2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1132384-A3
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1132385-A3
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1132384-A2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1237885-A4
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-0234738-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1237885-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6441199-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2784104-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6790967-B2 |
| priorityDate |
1996-12-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |