Abstract: A process for the manufacture of (all-rac)-?-tocopherol by the acid-catalyzed reaction of trimethylhydroquinone with isophytol or phytol is characterized by carrying out the reaction in the presence of methane trisulphonate as the catalyst in an organic solvent. The product of the process is the most active and industrially most important member of the vitamin E group.

Abstract: A process for the manufacture of (all-rac)-?-tocopherol by the acid-catalyzed reaction of trimethylhydroquinone with isophytol or phytol is characterized by carrying out the reaction in the presence of methane trisulphonate as the catalyst in an organic solvent. The product of the process is the most active and industrially most important member of the vitamin E group.

Abstract: The present invention is a method of making (all-rac)-&agr;-tocopherol in a reaction having the following steps: a) reacting trimethylhydroquinone and a phytol selected from the group consisting of isophytol and phytol in the presence of a bis(perfluorinated hydrocarbyl sulphonyl)imide catalyst or a metal salt thereof of formula I: [(R1SO2)2N]xR2  (I)  wherein each R1, independently, signifies a perfluoroalkyl group CnF2n+1 or a pentafluorophenyl, or both symbols R1 together signify a poly-difluoromethylene group—(CF2)m—, with the proviso that both symbols R1 cannot simultaneously signify trifluoromethyl, R2 signifies a proton or a cationic form of a metal selected from the group consisting of boron, magnesium, aluminum, silicon, scandium, titanium, vanadium, manganese, iron, cobalt, nickel, copper, zinc, yttrium, zirconium, rhodium, palladium, silver, tin, lanthanum, cerium, praseodymium, neodymium, europium, dysprosium, thulium, ytterbium, hafnium, platinum, an

Abstract: The present invention is a method of making (all-rac)-&agr;-tocopherol in a reaction having the following steps:

Abstract: A method of making (all-rac.)-&agr;-tocopherol by the acid-catalyzed condensation of trimethylhydroquinone with isophytol or phytol wherein the condensation is carried out in the presence of a tris(perfluoroalkanesulphonyl or pentafluorobenzenesulphonyl)methane or a metal salt thereof as the catalyst in an organic solvent. In addition to the metal salt, a Bronsted acid, e.g. sulfuric acid, phosphoric acid or p-toluenesulphonic acid, may be used as a co-catalyst. The product of the method of making is the most active member of the vitamin E group.

Abstract: A method of making (all-rac.)-&agr;-tocopherol by the acid-catalyzed condensation of trimethylhydroquinone with isophytol or phytol wherein the condensation is carried out in the presence of a tris(perfluoroalkanesulphonyl or pentafluorobenzenesulphonyl)methane or a metal salt thereof as the catalyst in an organic solvent. In addition to the metal salt, a Bronsted acid, e.g. sulfuric acid, phosphoric acid or p-toluenesulphonic acid, may be used as a co-catalyst. The product of the method of making is the most active member of the vitamin E group.