Process for the manufacture of hydroquinone dimethyl ethers
AssigneeHoechst Aktiengesellschaft
InventorRudolf Pistorius
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Abstract
Hydroquinone dimethyl ethers of the formula ##STR1## wherein R is H, an alkyl group having from 1 to 4 carbon atoms or halogen ARE PREPARED BY CATALYTICAL HYDROGENATION OF BENZOQUINONE TETRAMETHYL DIKETALS OF THE FORMULA ##STR2## wherein R has the same meaning as in formula I at a temperature from about 0.degree. to +150.degree. C. As the starting compounds II may be obtained by anodic oxidation of benzene and the corresponding benzene derivatives in methanol hydroquinone dimethyl ethers I used, for example for the manufacture of dyestuffs, may be obtained in simple manner by using benzene or the corresponding benzene derivative as starting products.
Claims7
Process for the manufacture of hydroquinone dimethyl ethers of the formula ##STR6## wherein R is hydrogen, an alkyl group having from 1 to 4 carbon atoms or hydrogen, which comprises hydrogenating catalytically p-benzoquinone tetramethyl diketals of the formula ##STR7## wherein R has the same meaning as in formula I, in the presence of a noble metal catalyst at a temperature from about 0.degree. to +150.degree. C.
Dependencies are inferred from the claim text.