Ethyl 7-(2,3,4,5-tetrafluorophenyl)-7-oxoheptanoate

Ethyl 6-(2,3,4,5-tetrafluorophenyl)-6-oxohexanoate

Ethyl 6-(2,4,5-trimethoxyphenyl)-6-oxohexanoate

Ethyl 5-(4-n-Butylphenyl)-5-oxovalerate

Ethyl 7-(4-n-Propylphenyl)-7-oxoheptanoate

Ethyl 4-(3-Ethoxyphenyl)-4-oxobutanoate

Ethyl 5-[4-(Ethylthio)phenyl]-5-oxovalerate

Ethyl 5-(4-tert-Butyl-2,6-dimethylphenyl)-5-oxovalerate

Ethyl 5-(2,3,4,5,6-Pentamethylphenyl)-5-oxovalerate

Ethyl 4-(4-Chloro-2-methylphenyl)-4-oxobutanoate

Ethyl 4-(3-Chloro-5-fluorophenyl)-4-oxobutanoate