Telechelics star allyl

Substituted farans have been shown to be effective end-quenchers in both the TiCU- and BCls-initiated polymerization of PIBs resulting in quantitative functionalization as determined by NMR. In addition, the allylic cation formed upon functionalization was found to be an effective initiating species for the polymerization of methyl vinyl ether to form the corresponding PIB-I7-PVE by sequential monomer addition, and the concept was extended to the preparation of three-armed star block polymers. Other bis-furanyl derivatives have also been used as coupling agents for the preparation of telechelic PIBs. °... 

Ivan, B. and Kennedy, J.P. (1990) Living carbocationic polymerization. XXX. One-pot synthesis of allyl-terminated linear and tri-arm star polyisobutylenes, and epoxy- and hydro xy-telechelics thereftom. Journal of Polymer Science Part A Polymer Chemistry, 28,89-104. 

Allyl-terminated linear and triarm star PIBs and epoxy and hydroxy telechelics therefrom have been reported by Ivan and Kermedy. Allyl functional PIBs were obtained in a simple one pot procedure involving living IB polymerization using TiCU as coinitiator followed by end-quenching with ATMS. This method is commercially employed by Kaneka Corp. (lapan) for the synthesis of allyl telechelic PIB, a precursor to moisture curable PIBs. The procedure was based on earlier reports by Wilczek and Kennedy that demonstrated quantitative allylation of PIB-Cl by ATMS in the presence of Et2AlCl or TiCh. Quantitative hydroboration followed by... 

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