Ethyl 4-(3,5-difluorophenyl)-4-oxobutyrate

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

Ethyl 3-(2-oxopropyl)benzoate

ethyl 3-methyl-5-oxo-5-phenylvalerate

ethyl 8-(3-bromo-4-methylphenyl)-8-oxooctanoate