Process for producing 2,2,4-trimethyl-6-hydroxy-7-substituted chromans

A process for producing a 2,2,4-trimethyl-6-hydroxy-7-substituted chroman which comprises reacting a 2-substituted hydroquinone with 2-methyl-2,4-pentanediol in the presence of a Friedel-Crafts catalyst, said substituent being selected from the group consisting of

• i. a long straight chain alkyl group having 6 to 18 carbon atoms,
• ii. a branched chain alkyl group having 3 to 18 carbon atoms,
• iii. a straight chain alkenyl group having 6 to 18 carbon atoms,
• iv. a branched chain alkenyl group having 3 to 18 carbon atoms,
• v. a phenyl group,
• vi. a naphthyl group,
• vii. a phenyl group substituted with one or more members of the group consisting of an alkyl group having 1 to 12 carbon atoms, a nitro group, an amino group, an acyl group having 2 to 13 carbon atoms, a carboxyl group or a sulfo group, or
• viii. a naphthyl group substituted with one or more members of the group consisting of an alkyl group having 1 to 12 carbon atoms, a nitro group, an amino group, an acyl group having 2 to 13 carbon atoms, a carboxyl group or a sulfo group.