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Synthesis of Telechelic Olefin Polymers via Catalyzed Chain Growth on Multinuclear Alkylene Zinc Compounds
Multinuclear
alkylene zinc (MAZ) compounds of the type EtZn-(R″-Zn)<sub><i>n</i></sub>-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 bisÂ(salicylaldiminato)ÂZrÂ(IV)
complex, [(2-methylcyclohexyl)ÂNî—»CHÂ(2-O-C<sub>6</sub>H<sub>3</sub>-3,5-di-<i>tert</i>-butyl)]<sub>2</sub>ZrMe<sub>2</sub>, 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