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145ChemInform Abstract The ternary system cobalt acetylacetonate-triphenylphosphine-diethylaluminum chloride catalyzes the cycloaddition reaction of the norbornadienes (I) with the acetylenic compounds (II), (V) and (VI), or (XII), producing the tetracyclic ring system mentioned in the title. (Further examples are given in the original paper).

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