ethyl 4-(4-ethylphenyl)-4-oxobutyrate

ethyl 6-(4-isopropylphenyl)-6-oxohexanoate

ethyl 5-(4-hexylphenyl)-5-oxovalerate

ethyl 4-oxo-4-(4-n-propoxyphenyl)butyrate

ethyl 4-(4-hexyloxyphenyl)-4-oxobutyrate

ethyl 7-(2,3-dimethoxyphenyl)-7-oxoheptanoate

ethyl 8-(2,5-dimethoxyphenyl)-8-oxooctanoate

ethyl 5-(2,6-dimethoxyphenyl)-5-oxovalerate

ethyl 6-(3,5-dimethoxyphenyl)-6-oxohexanoate

Ethyl 5-[3-(N,N-Dimethylamino)phenyl]-5-oxovalerate

Ethyl 4-[4-(N,N-Dimethylamino)phenyl]-4-oxobutanoate