Ethyl 6-cyclobutyl-6-oxohexanoate

Ethyl 5-oxo-5-(4-pyridyl)valerate

Ethyl 4-propionylbenzoate

ethyl 5-(3,4-dichlorophenyl)-5-oxovalerate

Ethyl 5-methyl-4-oxohexanoate

Ethyl 9-methyl-8-oxodecanoate

ethyl 6-(4-iodophenyl)-6-oxohexanoate

ethyl 8-oxo-8-(2-trifluoromethylphenyl)octanoate

Ethyl 6-oxo-6-(4-trifluoromethylphenyl)hexanoate

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

ethyl 6-(2,5-dichlorophenyl)-6-oxohexanoate