Patent ID: 7893275

Claim:
A production process for producing a polycyclic ketone compound according to Formula I: wherein R 1 is a hydroxyl group, a halogen atom, a silyloxy group which may be substituted, methoxy or methoxymethoxy; R 2 may be independent from each other and the same as or different from each other and is a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, a C 1 to C 3 alkyl group or a C 1 to C 3 alkoxy group which may be substituted or two groups of R 2 form a condensed benzene ring together with adjacent carbon atoms; R 3 may be independent from each other and the same as or different from each other and is a halogen atom, a hydroxyl group or a C 1 to C 3 alkyl group which may be substituted or two groups of R 3 form a condensed cyclohexyl ring together with adjacent carbon atoms; R 4 is a C 1 to C 3 alkyl group which may be substituted, a vinyl group, a phenyl group or a tolyl group; m is 0 or 1; and n is 0 or 1, wherein the compound according to Formula I is produced by subjecting a compound according to Formulae (Ia) or (IIb) to acidic conditions.