Dimethylcyclobutanone compounds, dimethylcyclobutane compounds, and processes for preparing the same

A process for preparing a dimethylcyclobutanone compound of the following general formula (2A):

• wherein X12 represents an acyloxy group having 1 to 10 carbon atoms including a carbon atom of a carbonyl group, an alkoxycarbonyloxy group having 2 to 10 carbon atoms including a carbon atom of a carbonyl group, an alkanesulfonyloxy group having 1 to 10 carbon atoms, an arenesulfonyloxy group having 6 to 20 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryloxy group having 6 to 12 carbon atoms, a silyloxy group having 3 to 20 carbon atoms or a halogen atom,
• the process comprising
• reacting an acid halide of the following general formula (7):
• wherein X9 represents a halogen atom,
• with an allyl compound of the following general formula (8):
• H2C═CHCH2X12 (8)
• wherein X12 is as defined above,
• in the presence of a base to produce the dimethylcyclobutanone compound (2A).