Synthesis and structure of stilbene crowns.

Syntheses of $\text{E}$- and $\text{Z}$-a,e]-dibenzo-7,10,13-trioxacyclotrideca-1,3,5-triene, $\text{1}$ (n=1) and $\text{E}$- and $\text{Z}$-e,a]-dibenzo-7,10,13,16-tetraoxacyclohexadeca-1,3,5-triene, $\text{1}$ (n=2) are described and the X-ray structure of E-$\text{1}$ (n=1) is reported.