Method for producing α-allylated cycloalkanone

A method for producing an α-allylated cycloalkanone represented by Formula (IV), the method comprising

• reacting a compound represented by Formula (I) and/or a compound represented by Formula (II) with a compound represented by Formula (III) in the presence of an acid catalyst to produce an α-allylated cycloalkanone represented by Formula (IV),
• wherein the acid catalyst includes an acid catalyst that consists of an ammonium cation and an anion
• where R1, R2, and R3 are the same or different and each of them is an alkyl group having 1 or more and 4 or less of carbon atoms, the group -A1- is an alkylene group having 4 or more and 20 or less of carbon atoms that optionally contains a hetero atom and optionally has a substituent, and where the front bond of the group -A1- refers to a bond that binds to the carbon atom C1 and the back bond of the group -A1- refers to a bond that binds to the carbon atom C2 and R4 is a hydrogen atom or an alkyl group having 1 or more and 4 or less of carbon atoms,
• the ammonium canon is represented b Formula (X) or Formula (XI);
• where R11, R12, R13, and R14 are the same or different and each of them is a hydrogen atom or an alkyl group having 1 or more and 5 or less of carbon atoms,
• the anion is a sulfonate anion represented by Formula (XII) or a halide ion:
• where R21 is a hydrogen atom or an alkyl group having 1 or more and 5 or less of carbon atoms.