文摘
Trimethylated cyclodextrins with a phosphine ligand and ruthenium (PCy2Ru-CDs) realize supramolecular polymerization catalysts for ring-opening metathesis polymerization (ROMP). Although PCy2Ru-尾CD shows a low polymerization activity for 7-oxanorbornene dimethanol (7-ONorOH2) in organic solvents, it exhibits a high ROMP activity for 7-ONorOH2 in aqueous solutions. The ROMP activity of PCy2Ru-尾CD is higher than that of PCy2Ru-伪CD. The addition of competitive guest molecules decreases the polymer yield, indicating that complexation between PCy2Ru-CD and 7-ONorOH2 in water plays an important role in the increased polymer yield.