Preparation of vitamin E
PCT No. PCT/EP93/00498 Sec. 371 Date Sep. 9, 1994 Sec. 102(e) Date Sep. 9, 1994 PCT Filed Mar. 5, 1993 PCT Pub. No. WO93/19057 PCT Pub. Date Sep. 30, 1993.A process for preparing dl- alpha -tocopherol or dl- alpha -tocopheryl acetate by acid-catalyzed reaction of 2,3,5-trimethylhydroquinone (TMH) wi...
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| creator | KIEFER HANS JAEDICKE HAGEN GRAFEN PAUL |
| description | PCT No. PCT/EP93/00498 Sec. 371 Date Sep. 9, 1994 Sec. 102(e) Date Sep. 9, 1994 PCT Filed Mar. 5, 1993 PCT Pub. No. WO93/19057 PCT Pub. Date Sep. 30, 1993.A process for preparing dl- alpha -tocopherol or dl- alpha -tocopheryl acetate by acid-catalyzed reaction of 2,3,5-trimethylhydroquinone (TMH) with phytol or isophytol in a solvent at elevated temperature, with or without subsequent esterification of the resulting tocopherol with acetic anhydride, entails the reaction being carried out in the presence of a mixture of ortho-boric acid and certain aliphatic di- or tricarboxylic acids, preferably in the presence of a mixture of ortho-boric acid and oxalic acid. |
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No. WO93/19057 PCT Pub. Date Sep. 30, 1993.A process for preparing dl- alpha -tocopherol or dl- alpha -tocopheryl acetate by acid-catalyzed reaction of 2,3,5-trimethylhydroquinone (TMH) with phytol or isophytol in a solvent at elevated temperature, with or without subsequent esterification of the resulting tocopherol with acetic anhydride, entails the reaction being carried out in the presence of a mixture of ortho-boric acid and certain aliphatic di- or tricarboxylic acids, preferably in the presence of a mixture of ortho-boric acid and oxalic acid.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record> |
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| subjects | APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY HETEROCYCLIC COMPOUNDS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING |
| title | Preparation of vitamin E |
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