ethyl 2,4,4-trimethyl-6-oxocyclohexene-1-carboxylate

ethyl 5,5-dimethyl-3-oxooct-7-enoate

6-bromo-4,4-dimethylhex-1-ene

diethyl 2-(2-phenylpropan-2-yl)propanedioate

3,3,4-trimethylpent-4-enoic acid