Process for producing a 2-tertiary-alkyl substituted anthraquinone

摘要

A process for producing a 2-tertiary-alkyl substituted anthraquinone, characterized by carrying out catalytic oxidation of a diphenylmethane type compound having the formula <IMAGE> I wherein R1 and R2 are different from each other, and independently hydrogen or tertiary-alkyl having 4 and 5 carbon atoms with the proviso that one of R1 and R2 is hydrogen, and R3 is alkyl having 1-3 carbon atoms, in vapor phase in the presence of a catalyst comprising vanadium oxide is disclosed.