THE FIRST STERICALLY REGULAR CHIRAL CONJUGATED CROWN-ETHER POLYMER

The coupling of (S)-6,6'-dibromo-2,2'-binaphtho-20-crown with 1,4-diet hynyl-2,5-dioctadecyloxybenzene in the presence of Pd(PPh(3))(4) and C uI catalysts leads to the formation of the first sterically regular ch iral conjugated crown ether polymer. This polymer is soluble in organi c solvents. GPC analysis shows that the molecular weight of this polym er is M(w) = 10.500 and M(n) = 5,300 (PDI = = 2.0). [alpha](D) = 120.9 (c = 0.95, THF). Another soluble crown ether polymer has also been ma de from the racemic binaphthyl monomers. Its molecular weight is M(w) = 27,900 and M(n) = 11.500 (PDI = 2.4). Copyright (C) 1996 Elsevier Sc ience Ltd