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发明公开
CN103080084A TMHQ的制备方法 有权

TMHQ的制备方法
摘要：
本发明涉及一种用于制备2,3,5-三甲基-氢-对苯醌的方法，其包括下列步骤：a)在氢化催化剂的存在下、在有机溶剂中用氢气氢化2,6-二甲基-对苯醌，以得到2,6-二甲基-氢-对苯醌；b)在有机溶剂中使2,6-二甲基-氢-对苯醌与仲胺和甲醛反应，以得到2,6-二甲基-3-(N,N-二取代氨甲基)-氢-对苯醌；c)在氢解催化剂的存在下、在有机溶剂中使2,6-二甲基-3-(N,N-二取代氨甲基)-氢-对苯醌与氢气反应，以得到2,3,5-三甲基-氢-对苯醌；其中步骤a)、b)和c)中的有机溶剂均独立地选自由下列溶剂组成的组：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意混合物。优选地，步骤a)、b)和c)中的有机溶剂都是相同的。
摘要（英）：

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.

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