Synthesis and Photochemical Properties of Stilbenophanes Tethered by Silyl Chains. Control of (2π + 2π) Photocycloaddition, Cis−Trans Photoisomerization, and Photocyclization
photochemical and photophysical properties were examined. Direct photoirradiation of macrocyclic stilbenophanes gave intramolecular photocycloadducts stereoselectively, and the efficiency increased with decreasing distance between the two stilbene units. The triplet-sensitized photoreaction of stilbenophanes caused cis−transphotoisomerization. Photoreactions of cis-fixed stilbenophanes under an oxygen