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Chain-and step-growth polymerizations mediated by late transition metal complexes

机译：后期过渡金属络合物介导的链增长聚合

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摘要

A review with 86 references covering chain-growth (insertion, metathesis) polymerization and step-growth (metathesis polycondensation of acyclic dienes, Heck-type polycondensation of haloarene derivatives, etc.) polymerization, promoted by catalysts based on late transition metals and each dicsussed in relation to monomer and catalyst type. The nature of cata- lyst's active sites is described and polymerization mechanisms are discussed. The most representative Pd-based catalysts are duly emphasized. The chain- and the step-growth models of propagation of polymerization are intercompared in terms of the oxidation state of the Pd species in the cata- lysts. The former mode keeps the oxidation state of palladium [Pd(II)] unaf- fected; the latter mode allows the oxidation state to vary from Pd(Il) to Pd(O) (and back).
机译：综述有86种参考文献，涵盖了链增长（插入，复分解）聚合和步增长（无环二烯的复分解聚，卤代芳烃衍生物的Heck型缩聚等）聚合反应，该反应是由基于晚过渡金属的催化剂促进的，并进行了二元分析关于单体和催化剂类型。描述了催化剂活性部位的性质，并讨论了聚合机理。适当强调了最具代表性的Pd基催化剂。就催化剂中Pd物种的氧化态而言，聚合反应的链增长模型和逐步增长模型是可比的。前一种模式使钯[Pd（II）]的氧化态不受影响。后一种模式允许氧化态从Pd（II）到Pd（O）（然后返回）变化。

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