ethyl 4-oxo-4-(4-thiomethylphenyl)butyrate

ethyl 8-(2-naphthyl)-8-oxooctanoate

Ethyl 4-(2-naphthyl)-4-oxobutyrate

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

Ethyl 4-(2,6-difluorophenyl)-4-oxobutyrate

Ethyl 6-(2,5-difluorophenyl)-6-oxohexanoate

Ethyl 4-(3-cyanophenyl)-4-oxobutyrate

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

Ethyl 4-(3,5-difluorophenyl)-2,2-dimethyl-4-oxobutyrate

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

Ethyl 8-cyclohexyl-8-oxooctanoate

Ethyl 5-cyclobutyl-5-oxovalerate

Ethyl 6-cyclopropyl-6-oxohexanoate

Ethyl 4-oxooctanoate

Ethyl 4-oxononanoate