Dimethyl terephthalate → Dimethyl Cyclohexane-1,1-dicarboxylate

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In the past 1,4-CHDM has been made by a process in which dimethyl terephthalate is subjected to hydrogenation using a catalyst of Ru or Pd carried on alumina to give dimethyl cyclohexanedicarboxylate, and then a side chain of the resulting ester is subjected to a hydrogenation reaction in the presence of a Cu—Zn oxide catalyst, to manufacture 1,4-CHDM, as mentioned, for example, in JP-W-8-510686. In addition, in JP-A-6-228028 is described a process for the manufacture of 1,4-CHDM where dialkyl terephthalate is subjected to hydrogenation to give dimethyl 1,4-cyclohexanedicarboxylate, and then the side chain of the product is hydrogenated using a catalyst containing Ru and Sn to manufacture 1,4-CHDM.

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