ethyl 6-(4-methylphenyl)-6-oxohexanoate

ethyl 5-(4-fluoro-3-methylphenyl)-5-oxovalerate

ethyl 4-oxo-4-(4-thiomethylphenyl)butyrate

ethyl 8-(1-naphthyl)-8-oxooctanoate

Ethyl 5-(2,3-difluorophenyl)-5-oxovalerate

Ethyl 4-(2,5-difluorophenyl)-4-oxobutyrate

Ethyl 6-(3-cyanophenyl)-6-oxohexanoate

ethyl 8-(4-biphenyl)-8-oxooctanoate

Ethyl 5-cyclohexyl-5-oxovalerate

Ethyl 5-cyclobutyl-5-oxovalerate

Ethyl 6,6-dimethyl-5-oxoheptanoate