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    • 5. 发明授权
    • Preparation of 2,3,5-trimethyl-p-benzoquinone
    • 制备2,3,5-三甲基 - 对苯醌
    • US5041572A
    • 1991-08-20
    • US493103
    • 1990-03-13
    • Ulrich HoercherBarbara JesselBernhard BockstiegelPaul GrafenHarald Laas
    • Ulrich HoercherBarbara JesselBernhard BockstiegelPaul GrafenHarald Laas
    • B01J27/122C07B61/00C07C46/08C07C50/02
    • C07C46/08
    • 2,3,5-Trimethyl-p-benzoquinone is prepared by oxidation of trimethylphenol with oxygen or an oxygen-containing gas in the presence of a catalyst containing a copper(II) halide in a two-phase reaction medium consisting of water and an aliphatic alcohol at elevated temperatures by a process in which the reaction is carried out in a mixture of water and a saturated aliphatic alcohol of 12 to 18 carbon atoms, having a flashpoint greater than 120.degree. C., such as 1-dodecanol, 1-tetradecanol, 1-hexadecanol or 1-octadecanol, in particular 1-dodecanol, and at from 60.degree. to 100.degree. C.Particularly good yields of TMQ are obtained if the reaction is carried out in the presence of a copper(II) halide, such as CuCl.sub.2 or CuBr.sub.2, and of an alkaline earth metal halide, in particular CaCl.sub.2 or MgCl.sub.2, or of an alkali metal halide, in particular LiCl or NaCl, as the catalyst system.
    • 通过在含有卤化铜(II)的催化剂存在下,用氧或含氧气体氧化三甲基苯酚,制备2,3,5-三甲基对苯醌,所述两相反应介质由水和 脂族醇在高温下通过反应在水和12至18个碳原子的饱和脂族醇的混合物中进行的方法进行,其闪点大于120℃,如1-十二醇,1- 十四烷醇,1-十六烷醇或1-十八烷醇,特别是1-十二烷醇,以及60-100℃。如果反应在卤化铜(II)存在下进行,则得到特别好的收率的TMQ, 例如CuCl 2或CuBr 2,以及碱土金属卤化物,特别是CaCl 2或MgCl 2,或碱金属卤化物,特别是LiCl或NaCl,作为催化剂体系。
    • 9. 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​​。