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

ethyl 6-(4-heptyloxyphenyl)-6-oxohexanoate

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

ethyl 8-(2,6-dimethoxyphenyl)-8-oxooctanoate

Ethyl 4-(4-methoxy-3-nitrophenyl)-4-oxobutyrate

Ethyl 6-(2-acetoxyphenyl)-6-oxohexanoate

Ethyl 4-[3-(N,N-Dimethylamino)phenyl]-4-oxobutanoate

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

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

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

Ethyl 5-(5-Chloro-2-methoxyphenyl)-5-oxovalerate