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    • 10. 发明授权
    • Preparation of tocopheral carboxylates or tocotrienyl esters by acid-catalyzed reaction with carboxylic acids
    • 通过与羧酸的酸催化反应制备生育酚羧酸酯或生育三烯基酯
    • US06365758B1
    • 2002-04-02
    • US09013813
    • 1998-01-26
    • Joanna Linda von dem Bussche-HünnefeldHagen JaedickeGuido HarmsHarald Laas
    • Joanna Linda von dem Bussche-HünnefeldHagen JaedickeGuido HarmsHarald Laas
    • C07D31104
    • C07D311/72
    • A process for preparing tocopheryl esters or tocotrienyl esters by acid-catalyzed esterification of a tocopherol or a tocotrienol in a solvent while stirring at elevated temperature, which comprises a) carrying out the esterification with the appropriate carboxylic acid, b) carrying out the esterification with from 2.5 to 6 mol of the carboxylic acid in an aliphatic, cycloaliphatic or aromatic hydrocarbon boiling in the range from 80 to 200° C., or else with from 1.0 to 2.5 mol of the carboxylic acid in a mixture consisting of an aliphatic or cycloaliphatic hydrocarbon boiling in the range from 80 to 200° C. and a cyclic carbonate of the formula II or a &ggr;-lactone of the formula III  where R1, R2 and R3 are each H or lower alkyl, and R4 is H, lower alkyl, phenyl or methoxymethyl, as solvent, c) using a nonoxidizing strong inorganic or organic acid, preferably sulfuric acid, boroxalic acid or benzene- or toluenesulfonic acids, in catalytic amounts as acid catalyst, and d) continuously removing the water formed in the reaction by azeotropic distillation during the reaction.
    • 一种在高温下搅拌下在溶剂中通过酸催化酯化生育酚或生育三烯酚制备生育酚酯或生育三烯基酯的方法,该方法包括a)用合适的羧酸进行酯化,b)进行酯化反应 在80至200℃范围内沸腾的脂肪族,脂环族或芳族烃中的羧酸为2.5至6摩尔,或者由脂族或脂环族烃组成的混合物中的1.0至2.5摩尔羧酸 沸程在80至200℃的范围内,和式II的环状碳酸酯或式III的γ-内酯,其中R 1,R 2和R 3各自为H或低级烷基,且R 4为H,低级烷基,苯基 或甲氧基甲基,作为溶剂,c)使用非氧化的强无机或有机酸,优选硫酸,硼酸或苯或甲苯磺酸,催化量为酸催化剂,并且d)连续重新 在反应期间通过共沸蒸馏移动反应中形成的水​​。