A New Method To Benzophosphole By Intramolecular Electrophilic Cyclization

Previous studies have found that phosphoxides react with oxalyl chloride to produce quaternary phosphole,which is carried out by intramolecular electrophilic cycling.In addition,the methoxy group can be used as a nucleophilic group,through the intramolecular attack of quaternary phosphorylated phosphocyclopentadiene to get a special structure of the double ring skeleton molecules.We used this method to synthesize a series of special bicyclic compounds with phosphole as skeleton.The reaction conditions have a good applicability for similar substrates.The target product can stimulate a strong red orange light in the solid state under 365 nm wavelength,.This character comes from the common double-ring skeleton structure.This confirms that phosphole and its derivatives are promising compounds in the field of organic electroluminescence.