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(IMesH2)(PCy3) [IMesH2 = 1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene], has been achieved by treating the vinyl groups in PFV chain ends with Mo(CHCMe2Ph)(N-2,6-Me2C6H3)[OCMe(CF3)2]2 followed by Wittig-type cleavage with 4-Me3SiOC6H4CHO; precise synthesis of ABA type amphiphilic triblock copolymers has been accomplished by grafting PEG into both the PFV chain ends.