5-methyl-7-oxo-7-phenylhept-5-enal

5-methyl-7-oxo-7-pyridin-4-ylhept-5-enal

5-methyl-7-(4-nitrophenyl)-7-oxohept-5-enal

5-methyl-7-oxooct-5-enal

5-methyl-7-oxo-9-phenylnon-5-enal