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    • 1. 发明授权
    • Process for the manufacture of TMHQ
    • 制造TMHQ的过程
    • US08809591B2
    • 2014-08-19
    • US13817012
    • 2011-08-25
    • Werner BonrathThomas NetscherJan SchützBettina Wüstenberg
    • Werner BonrathThomas NetscherJan SchützBettina Wüstenberg
    • C07C45/62C07C45/65C07C215/50C07C225/00C07D295/116C07D311/04
    • C07C45/65C07C37/002C07C37/07C07C45/62C07C213/00C07C215/50C07C221/00C07D295/096C07D295/116C07D311/04C07C39/08
    • The present invention is directed to a process for the manufacture of 2,3,5-trimethyl-hydro-p-benzoquinone comprising the following steps: a) hydrogenating 2,6-dimethyl-p-benzoquinone with hydrogen in the presence of a hydrogenation catalyst in an organic solvent to obtain 2,6-dimethyl-hydro-p-benzoquinone; b) reacting 2,6-dimethyl-hydro-p-benzoquinone with a secondary amine and formal-dehyde in an organic solvent to obtain 2,6-dimethyl-3-(N,N-disubstituted aminomethyl)-hydro-p-benzoquinone; c) reacting 2,6-dimethyl-3-(N,N-disubstituted aminomethyl)-hydro-p-benzoquinone with hydrogen in the presence of a hydrogenolysis catalyst in an organic solvent to obtain 2,3,5-trimethylhydro-p-benzoquinone; wherein the organic solvent in all steps a), b) and c) is independently selected from the group consisting of methyl tert.-butyl ether, ethyl tert.-butyl ether, methyl tert.-amyl ether, methoxycyclopentane and any mixtures thereof. Preferably the organic solvent used in all steps a), b) and c) is the same.
    • 本发明涉及一种制备2,3,5-三甲基 - 氢 - 对苯醌的方法,包括以下步骤:a)在氢化存在下用氢气氢化2,6-二甲基对苯醌 催化剂在有机溶剂中得到2,6-二甲基 - 氢 - 对苯醌; b)使2,6-二甲基 - 对苯醌与仲胺和正型脱水在有机溶剂中反应,得到2,6-二甲基-3-(N,N-二取代氨基甲基) - 氢对苯醌 ; c)在氢解催化剂存在下,在有机溶剂中使2,6-二甲基-3-(N,N-二取代氨基甲基) - 氢对苯醌与氢气反应,得到2,3,5-三甲基氢对 - 苯醌 其中所有步骤a),b)和c)中的有机溶剂独立地选自甲基叔丁基醚,乙基叔丁基醚,甲基叔戊基醚,甲氧基环戊烷及其任何混合物。 在所有步骤a),b)和c)中使用的有机溶剂优选是相同的。