Ethyl 4-(2,3,4,5-tetrafluorophenyl)-4-oxobutanoate

Ethyl 6-(3,4,5-trichlorophenyl)-6-oxohexanoate

Ethyl 5-(2,4,5-trimethoxyphenyl)-5-oxovalerate

Ethyl 4-(4-n-Butylphenyl)-4-oxobutanoate

Ethyl 4-(4-n-Propylphenyl)-4-oxobutanoate

Ethyl 5-(3-Bromo-2-thienyl)-5-oxovalerate

Ethyl 5-(3-Methyl-2-thienyl)-5-oxovalerate

Ethyl 4-[3,4-(Ethylenedioxy)phenyl]-4-oxobutanoate

Ethyl 5-(2,3,5,6-Tetramethylphenyl)-5-oxovalerate

Ethyl 5-(3-Fluoro-4-methoxyphenyl)-5-oxovalerate