Preparation of 1,2,5,6,9,10-Hexaalkoxyhexahelicenes

Abstract

1,2,5,6,9,10-Hexaalkoxyhexahelicenes 3 represent [3]star compounds with a helical core. A multistep synthetic concept for 3 is discussed, in which the final step 16 → 3 is a twofold oxidative photocyclization. The linearly conjugated compounds 16 contain stilbene and vinylnaphthalene units.