Ethyl 4-(3-nitrophenyl)-4-oxobutyrate

ethyl 4-(2,3-dichlorophenyl)-4-oxobutyrate

ethyl 7-(2,4-dichlorophenyl)-7-oxoheptanoate

ethyl 4-(4-t-butylphenyl)-4-oxobutyrate

ethyl 7-oxo-7-(4-n-pentylphenyl)heptanoate

ethyl 5-(4-ethoxyphenyl)-5-oxovalerate

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

ethyl 6-oxo-6-(4-pentyloxyphenyl)hexanoate

ethyl 7-(4-heptyloxyphenyl)-7-oxoheptanoate

Ethyl 7-(2,4-dimethoxyphenyl)-7-oxoheptanoate

ethyl 5-(3,4-dimethoxyphenyl)-5-oxovalerate