1: BF3*Et2O, tris-(o,p-dibromophenyl)ammoniumyl hexachloroantimonate 2: 90 percent / tris-(o,p-dibromophenyl)ammoniumyl hexachloroantimonate / CH2Cl2 / 0.25 h / Ambient temperature; other arylacetaldehydes View Scheme

boron trifluoride diethyl etherate; TDBPA(1+)*SbCl6(1-) Yields of byproduct given;