Ethyl 4-(4-nitrophenyl)-4-oxobutyrate

Ethyl 4-oxo-4-(3-trifluoromethylphenyl)butyrate

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

Ethyl 8-(2,5-dichlorophenyl)-8-oxooctanoate

ethyl 6-(4-t-butylphenyl)-6-oxohexanoate

ethyl 5-(2-ethoxyphenyl)-5-oxovalerate

ethyl 8-oxo-8-(4-n-propoxyphenyl)octanoate

Ethyl 8-oxo-8-(4-isopropoxyphenyl)octanoate

Ethyl 6-(2,4-dimethoxyphenyl)-6-oxohexanoate

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

ethyl 7-(3,4-dimethoxyphenyl)-7-oxoheptanoate