title: Synthesis of telechelic olefin polymers via catalyzed chain growth on multinuclear alkylene zinc compounds.
abstract: Multinuclear alkylene zinc (MAZ) compounds of the type EtZn-(R″-Zn)n-Et (R″ = ethyl and propyl branched alkylene groups) were synthesized by a simple one-step procedure in nonpolar hydrocarbon solvents from α,ω-dienes (e.g., 1,7-octadiene or 1,9-decadiene) and diethylzinc using a bis(salicylaldiminato)Zr(IV) complex, [(2-methylcyclohexyl)N═CH(2-O-C6H3-3,5-di-tert-butyl)]2ZrMe2, as a catalyst. The MAZ serves as a divalent reversible chain-transfer agent for olefin polymerization, resulting in telechelic Zn-metalated polyolefins whose molecular weights are controllable over a wide range. The Zn-terminated telechelics serve as a polymer precursor for further reactions and can be converted into a variety of telechelic functionalized polyolefins in high yield.
authors.affiliation: Mitsui Chemicals Singapore R&D Centre , 50 Science Park Road, The Kendall, Science Park II, Singapore 117406.
authors.forename: Haruyuki
authors.initials: H
authors.lastname: Makio
authors.forename: Takashi
authors.initials: T
authors.lastname: Ochiai
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Mohri
authors.forename: Kouji
authors.initials: K
authors.lastname: Takeda
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Shimazaki
authors.forename: Yoko
authors.initials: Y
authors.lastname: Usui
authors.forename: Sadahiko
authors.initials: S
authors.lastname: Matsuura
authors.forename: Terunori
authors.initials: T
authors.lastname: Fujita