A cobalt complex used as a chiral selector of PVC membrane electrode. A highly active catalysts for the copolymerization of propylene oxide and carbon dioxide. (R,R)-(-)-N,N′-Bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamine (B431500) derivative, a ligand used in the preparation of Jacobsen's catalyst.