The Synthesis of New Type Diazo Compounds by 4-hydroxy-2,2,6,6-Tertramethyl-1-Piperidinyloxy 1 as The Phases Transfer Dehydrogenation Catalyst

It is well known that 4-hydroxy-2,2,6,6-tertramethyl-1-piperidinyloxyl is a stable nitroxyl radical. It can be used as antioxidants¹ and spin labeled compounds to mark protein, biomembrance and nucleic acid etc. Furthermore, as an efficient inhibitor, it can prevent olefin polymerizing by free radical. However, using 4-hydroxy-2,2,6,6-tertramethyl-1-piperidinyloxyl as the phase transfer catalyst has not been reported so far.