ethyl 6-(2,3-difluorophenyl)-6-oxohexanoate

ethyl 7-cyclobutyl-7-oxoheptanoate

Ethyl 4-oxohexanoate

Ethyl 4-oxononanoate

ethyl 8-oxoundecanoate

ethyl 2-(2-oxo-2-phenylethyl)benzoate

Ethyl 3-(2-oxo-2-phenylethyl)benzoate

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

Ethyl 4-(3-iodophenyl)-4-oxobutyrate

ethyl 7-(3-iodophenyl)-7-oxoheptanoate

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