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

Ethyl 8-(4-cyanophenyl)-8-oxooctanoate

Ethyl 5-cyclohexyl-5-oxovalerate

ethyl 2,2-dimethyl-4-oxo-4-(4-thiomethylphenyl)butyrate

ethyl 8-cyclopropyl-8-oxooctanoate

Ethyl 4-oxohexanoate

Ethyl 6-oxooctanoate

ethyl 8-oxotridecanoate

Ethyl 3-(1,3-dioxan-2-yl)propionate

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

Ethyl 4-(2-oxo-2-phenylethyl)benzoate