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

ethyl 8-(4-ethylphenyl)-8-oxooctanoate

ethyl 7-oxo-7-(4-n-pentylphenyl)heptanoate

ethyl 7-(4-hexylphenyl)-7-oxoheptanoate

ethyl 7-(4-ethoxyphenyl)-7-oxoheptanoate

Ethyl 4-oxo-4-(4-isopropoxyphenyl)butyrate

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

ethyl 7-oxo-7-(4-pentyloxyphenyl)heptanoate

Ethyl 6-(2,4-dimethoxyphenyl)-6-oxohexanoate

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

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