4,5-dimethylhexa-1,4-diene

3-(1,1,2-trimethyl-allyloxy)-butan-2-one

3-hydroxy-3,5,6-trimethylhept-5-en-2-one

3-hydroxy-3,4,4,5-tetramethylhex-5-en-2-one

3-(1,1,2-Trimethyl-propoxy)-but-3-en-2-one