Anti (pentafluorophenyl) boron, also known as tris(pentafluorophenyl) borane (Tris (pentafluorophenyl) borane, compared with traditional Lewis acid, has the advantages of chemical stability, strong acidity, easy to use, etc., known as non-traditional Lewis Chemicalbook acid. The application field of trans(pentafluorophenyl) boron has developed from the initial olefin polymerization cocatalyst to other fields of organic chemistry and polymer chemistry. The reaction catalyzed by tris(pentafluorophenyl)borane and the reaction catalyzed by traditional Lewis acid are very different in reaction mechanism and reaction results.