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- W2078604560 abstract "The catalyst Mo(CO)5py/C2H5AlCl2/(C4H9)4NCl was investigated in reactions of the cyclic olefins cyclopentene, exo- and endo-dicyclopentadiene, exo,exo-norbornadiene dimer and indene. For these olefins, the polymers obtained were mostly of the ring-opened type, but also exhibited ring retention to some extent, depending on the reaction temperature. Investigation of the polymerization of norbornene as promoted by both the Mo catalyst and Re(CO)5Cl/C2H5AlCl2 systems showed that, depending on the temperature of the reaction, both ring-retained and ring-opened units are present in the same chain. Evidence for the mechanism of propagation of polymerization, which was deduced to be a combination of insertion and olefin metathesis occurring on the same catalyst molecule, comes from NMR spectroscopy on 2,3-dideuterionorbornene, where 13C{2H} DEPT and INEPT spectra show migration of a deuterium atom from the 2-position of 2,3-dideuterionorbornene to a methylene group." @default.
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- W2078604560 date "1992-10-01" @default.
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- W2078604560 title "NMR studies on the mechanism of polymerization of cyclic olefins by a molybdenum catalyst" @default.
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- W2078604560 doi "https://doi.org/10.1016/0304-5102(92)80159-e" @default.
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