ethyl 5-(2,4-difluorophenyl)-5-oxovalerate

Ethyl 6-cyclopropyl-6-oxohexanoate

Ethyl 7,7-dimethyl-6-oxooctanoate

Ethyl 6-oxoundecanoate

ethyl 5-oxo-5-(3-pyridyl)valerate

Ethyl 4-(2-oxopropyl)benzoate

Ethyl 4-(3,4-dichlorophenyl)-4-oxobutyrate

ethyl 8-(4-bromo-2-methylphenyl)-8-oxooctanoate

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

Ethyl 4-(3-nitrophenyl)-4-oxobutyrate

ethyl 5-oxo-5-(2-trifluoromethylphenyl)valerate