Sythese von α und β-Sinensal

β-Sinensal (2,6-dimethyl-10-methylene-dodeca-2,6,11-trienal) was synthesized from the diene-aldehyde 5 . This was converted into the trans- and cis-triene-aldehydes 16 and 17 , which were condensed with the phosphorane 18 to give the corresponding two geometrical isomers ( 3 and 19 ) of β-sinensal.