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- W2003162132 abstract "A mechanism for the polymerization of olefins is proposed. An essentially octahedrally coordinated ion of a transition element with empty or nearly empty t2g orbitals carrying in its coordination sphere one alkyl group and having one vacant octahedral position is supposed to be the active center. In this model the monomeric olefin is coordinated in the vacant position through a “π bond.” It is shown that theoretically one may expect the transition metal-to-carbon bond to become more susceptible to radical breaking at the very moment the π bond between metal ion and olefin is formed. Based on this theoretical argument, the proposed mechanism: involves to a first approximation an electronic rearrangement and only small nuclear displacements. This mechanism may account for the low activation energy of the propagation step. It further relates catalytic activity to the ionization potential for a d electron of the transition metal and the nature of the negative ions used in the transition metal compound. It also provides a basis for the explanation of the formation of isotactic polymers when special solid catalyst systems are used." @default.
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- W2003162132 title "Ziegler-Natta catalysis I. Mechanism of polymerization of $alpha;-olefins with Ziegler-Natta catalysts*1" @default.
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- W2003162132 doi "https://doi.org/10.1016/0021-9517(64)90095-8" @default.
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