2,4-Di-tert-butylphenol → 2,4-DI-Tert-butylcyclohexanol

Beteiligte Stoffe

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The 2,4-di-tert-butylcyclohexanone can be synthesized, for example, by the following manner. 2,4-Di-tert-butylphenol (IV), which is commercially available at a low price, is hydrogenated by using a nickel catalyst to give 2,4-di-tert-butylcyclohexanol (VII). Then the compound (VII) is oxidized to give the aimed compound (I). The hydrogenation of the compound (IV) can be readily carried out without using any solvent or by using an alcohol such as methanol or a hydrocarbon such as hexane at a temperature of approximately 140° to 230° C. for approximately 3 to 24 hours. Examples of the nickel catalyst include Raney nickel and stabilized nickel. This nickel catalyst can be appropriately used in an amount of 0.01 to 5% based on the compound (IV). The oxidation of the compound (VII) into the compound (I) can be carried out by using a copper/chromium or copper/zinc dehydrogenation catalyst in the absence of any solvent at a temperature of approximately 150° to 250° C. for approximately 3 to 20 hours. The catalyst can be appropriately employed in an amount of approximately 0.1 to 10% by weight based on the compound (VII). Alternatively the compound (VII) can be readily oxidized by a conventional method for oxidizing a secondary alcohol into a ketone, such as Jones oxidation, Oppenauer oxidation, manganese dioxide oxidation or chromic acid oxidation.

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