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

ethyl 7-(2,5-difluorophenyl)-7-oxoheptanoate

ethyl 8-(2,6-difluorophenyl)-8-oxooctanoate

Ethyl-5-(4-cyanophenyl)-5-oxovalerate

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

Ethyl 6-cyclohexyl-6-oxohexanoate

Ethyl 5-cyclopropyl-5-oxovalerate

Ethyl 8-oxododecanoate

Ethyl 5-oxononanoate

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

Ethyl 4-propionylbenzoate