Synthesen in der Carotinoid-Reihe. 13. Mitteilung Synthese von Canthaxanthin†‡

A new synthesis for canthaxanthin, according to the scheme C19 + C2 + C19 = C40 using dehydro-retro-C19-aldehyde and acetylene is described. The synthetic material proved to be identical in its properties with the natural product isolated from Cantharellus cinnabarinus.