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The mechanistic puzzle of transition-metal-catalyzed skeletal rearrangements of enynes

机译:过渡金属催化的炔烃骨架重排的机理难题

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摘要

Three pathways actually compete in metal-catalyzed cyclizations of enynes in which the metal selectively activates the alkyne: an endocyclic process and two exo-cyclizations, one proceeding by anti attack of the alkene and a second one resulting in a syn addition. Although cyclobutenes may be formed in transition-metal-catalyzed cyclization of some enynes, particularly, 1,7-enynes. these compounds are not necessarily the intermediates in the skeletal rearrangement. Cyclobutenes are formed by ring expansion of syn-cyclopropyl metal-carbenes formed in the syn pathway.
机译:实际上,三个途径在金属催化的炔烃环化中竞争,其中金属选择性激活炔烃:一个内环过程和两个外环化,一个通过烯烃的反攻进行,第二个导致顺式加成。尽管环丁烯可能在某些烯类(尤其是1,7-烯类)的过渡金属催化环化反应中形成。这些化合物不一定是骨骼重排的中间体。通过在顺式途径中形成的顺式环丙基金属-卡宾的环膨胀形成环丁烯。

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