Ethyl 8-(4-t-butylphenyl)-8-oxooctanoate

ethyl 6-(4-hexyloxyphenyl)-6-oxohexanoate

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

ethyl 4-(2,5-dimethoxyphenyl)-4-oxobutyrate

ethyl 4-(3,4-dimethoxyphenyl)-4-oxobutyrate

Ethyl 6-[3-(N,N-Dimethylamino)phenyl]-6-oxohexanoate

Ethyl 8-[4-(N,N-Dimethylamino)phenyl]-8-oxooctanoate

Ethyl 5-[4-(N,N-Diethylamino)phenyl]-5-oxovalerate

Ethyl 8-(4-Chloro-2-fluorophenyl)-8-oxooctanoate

Ethyl 7-(2-Chloro-4-(methylthio)phenyl)-7-oxoheptanoate

Ethyl 8-(2-Chloro-4,5-difluorophenyl)-8-oxooctanoate