Double Cyclopolymerization of Functionalized Trienes Catalyzed by Palladium Complexes
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文摘
Pd鈭抎iimine complexes catalyze polymerization of 1,6,11-dodecatrienes having cyclic ester groups at the 4 and 9 positions to produce the polymers containing two trans-five-membered rings in the structural units. The doublecyclopolymerization of triene with cyclic acetal group yields the polymer with narrow molecular weight distribution (Mw/Mn = 1.20鈭?.66). The two five-membered rings in a monomer unit of these polymers are linked directly with racemo stereochemistry. Relative stereochemistry of the monomer units separated by ethylene spacer changes depending on the monomer and catalyst, and 91% syndioselectivity is obtained in the polymerization of the triene with cyclic acetal groups. Hydrolysis of the polymer containing cyclic acetal groups yields the polymer containing CH2OH groups.

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