Bis-Phosphoryl-Bridged Stilbenes Synthesized by an Intramolecular Cascade Cyclization

Bis-phosphoryl-bridged stilbenes have been synthesized using an intramolecular cascade cyclization. They show intense blue fluorescences
at longer wavelengths with higher quantum yields compared to those of the known element-bridged stilbenes. In addition, they have much
lower reduction potentials due to the inductive effect of phosphoryl groups. The incorporation of the phosphoryl moiety is an effective way
for the construction of highly electron-accepting π-conjugated systems.