Living Polymerization of Isocyanides with Palladium Complex as Efficient Initiator

摘要

Synthetic helical polyisocyanides with preferred handedness are of continuing interest due to their applications in enantiomeric separation,asymmetric catalysis,and chiral recognition.1 Polyisocyanides usually prepared by the living/controlled polymerization of appropriate isocyanides monomer with transition metals complexes as initiator/catalyst.Although Pd(Ⅱ)-Pd(Ⅱ)2 heteronuclear complex (1a) is an effective initiator for the polymerization of aryisocyanides,however,no polymerization was observed for the similar mononuclear Pd complex 1b,1c,and the di-palladium complex 1d (Figure 1).Therefore,explore novel Pd catalyst without the expensive Pt moiety for efficiently initiate the living polymerization of isocyanides is of great interest.