Japanese Patent JPH0379331

B2

Trimethyl-p-benzoquinone of the formula I (I) is prepared by a process wherein A. 2,5,6-trimethylcyclohex-2-en-1-one or 2,3,6-trimethylcyclohex-2-en-1-one is reacted with air or oxygen at from 0 DEG to 150 DEG C. in a virtually anhydrous low molecular weight alkanol in the presence of a catalytic amount of copper(I) oxide or copper(II) oxide and in the presence of from 1 to 10 moles of a hydrogen halide gas per mole of trimethylcyclohexenone, and thereafter B. the reaction mixture, which essentially contains 2,3,6-trimethylphenol and/or 4-halo-2,3,6-trimethylphenol, is mixed with an alkali metal alcoholate in an amount such that a sample, when moistened with water, has a pH of from 3 to 6, and is then reacted with air, pure oxygen or tert.-butyl hydroperoxide at from 0 DEG to 150 DEG C., or wherein from 1 to 10 mole equivalents of a hydrogen halide gas per mole of substrate to be reacted are passed into a mixture containing a virtually anhydrous low molecular weight alkanol and a catalytic amount of copper(I) oxide or copper(II) oxide at from 0 DEG to 30 DEG C., an alkali metal alcoholate is added in an amount such that a sample, when moistened with water, has a pH of from 3 to 6, about one mole equivalent of 2,3,6-trimethylphenol is added and the mixture is then reacted with air, oxygen or tert.-butyl peroxide at from 0 DEG to 150 DEG C. Trimethyl-p-benzoquinone is an important intermediate for the synthesis of vitamin E.

FURANKU TOEMERU
UERUNAA HOFUMAN

JP6931383A

December 18, 1991

April 21, 1983

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BASF AG

C07C46/00; B01J23/00; B01J23/72; B01J27/122; B01J31/02; C07B61/00; C07C37/07; C07C39/07; C07C45/00; C07C46/02; C07C46/04; C07C46/06; C07C46/08; C07C46/10; C07C50/02; C07C50/04; C07C67/00

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