ethyl 4-(4-t-butylphenyl)-4-oxobutyrate

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

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

Ethyl 4-(5-Chloro-2-methoxyphenyl)-4-oxobutanoate

Ethyl 4-(2-Chloro-4,5-difluorophenyl)-4-oxobutanoate

Ethyl 5-(3,4,5-trimethoxyphenyl)-5-oxovalerate

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