diethyl 2-methyl-2-(2-methyl-4-oxopentan-2-yl)propanedioate

diethyl 2-[(2-acetylcyclohexyl)methyl]propanedioate

diethyl 2-[(2,6-dimethyl-3-oxocyclohexyl)methyl]propanedioate

diethyl 2-methyl-2-(1-methyl-3-oxocyclohexyl)propanedioate

diethyl 2-methyl-2-(2-methyl-4-nitrophenyl)propanedioate