Exclusive End Functionalization of all-trans-Poly(fluorene vinylene)s Prepared by Acyclic Diene Metathesis Polymerization: Facile Efficient Synthesis of Amphiphilic Triblock Copolymers by Grafting Poly(ethylene glycol)

Facile, exclusive end functionalization of poly(9,9-di -n -octylfluorene-2,7-vinylene) (PFV), prepared by acyclic diene metathesis polymerization using Ru(CHPh)(Cl) 2 (IMesH 2 )(PCy 3 ) [IMesH 2 = 1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene], has been achieved by treating the vinyl groups in PFV chain ends with Mo(CHCMe 2 Ph)(N-2,6-Me 2 C 6 H 3 )[OCMe(CF 3 ) 2 ] 2 followed by Wittig-type cleavage with 4-Me 3 SiOC 6 H 4 CHO; precise synthesis of ABA type amphiphilic triblock copolymers has been accomplished by grafting PEG into both the PFV chain ends.