Ethyl 5,5-dimethyl-4-oxohexanoate

Ethyl 9,9-dimethyl-8-oxodecanoate

Ethyl 4-oxoheptanoate

Ethyl 4-oxo-4-(2-pyridyl)butyrate

Ethyl 3-(2-oxopropyl)benzoate

ethyl 7-(3,4-dichlorophenyl)-7-oxoheptanoate

ethyl-8-methyl-7-oxononanoate

Ethyl 7-methyl-6-oxooctanoate

ethyl 7-(3-nitrophenyl)-7-oxoheptanoate

Ethyl 6-oxo-6-(3-trifluoromethylphenyl)hexanoate

ethyl 5-(2,3-dichlorophenyl)-5-oxovalerate