ethyl 4-(3,4-difluorophenyl)-2,2-dimethyl-4-oxobutyrate

ethyl 7-(4-bromo-2-methylphenyl)-7-oxoheptanoate

ethyl 5-(3-bromo-5-methylphenyl)-5-oxovalerate

ethyl 6-(2-iodophenyl)-6-oxohexanoate

Ethyl 5-(4-iodophenyl)-5-oxovalerate

Ethyl 6-(3-nitrophenyl)-6-oxohexanoate

Ethyl 5-(4-nitrophenyl)-5-oxovalerate

Ethyl 5-oxo-5-(4-trifluoromethylphenyl)valerate

ethyl 7-oxo-7-(4-trifluoromethylphenyl)heptanoate

Ethyl 5-(2,4-dichlorophenyl)-5-oxovalerate

ethyl 4-(4-ethylphenyl)-4-oxobutyrate