4,6-dimethylcyclohexa-1,3-diene-1-carbaldehyde

(E,E)-N-tritylsulfanylbut-2-en-1-imine

1,1,3-tributoxybutane

3-trimethylsilylhepta-1,2,5-trien-4-ol

6-oxohept-2-en-4-yl acetate