[71] In most cases, 1-2 equiv. amount of DBU was used while only a catalytic amount of DBU was used for the oxidation of benzoin has not been reported so far. Surprisingly, in this work, with a catalytic amount of DBU (10mol%), a 92.5% yield of benzoin could be obtained after 5 hours under an open-air oxidation system without any other additives. As mentioned previously, K2CO3, as a traditional and common base, they are widely used in a variety of reactions like Suzuki coupling reaction, Sonogashira coupling, Heck reaction, and Hiyama coupling. There are also some reported work on selective oxidation of alcohols using the heterobimetallic Ru(II)-Rh(I)complex-K2CO3 , the I2-KI-K2CO3-H2O , the Pd(OAc)2/PPh3 catalytic system ,