Synthesis of the novel conjugated ω,ω′-diaryl/heteroaryl hexatriene system with the central double bond in a heteroaromatic ring: photochemical transformations of 2,3-divinylfuran derivatives

Compared to substituted o-divinylbenzenes, in which the intramolecular cycloaddition gives heteropolycyclic compounds, in this system no intramolecular cycloaddition of the vinyl groups took place. Along cis-trans isomerization, the phototransposition reactions and competitive intermolecular cycloaddition processes were observed.