ethyl 5-(4-t-butylphenyl)-5-oxovalerate

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

ethyl 8-(4-heptyloxyphenyl)-8-oxooctanoate

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

ethyl 7-(2,6-dimethoxyphenyl)-7-oxoheptanoate

Ethyl 4-(2-acetoxyphenyl)-4-oxobutyrate

ethyl 8-(3,5-dimethoxyphenyl)-8-oxooctanoate

Ethyl 7-[3-(N,N-Dimethylamino)phenyl]-7-oxoheptanoate

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

Ethyl 6-[4-(N,N-Diethylamino)phenyl]-6-oxohexanoate

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