Abstract
Diphenylacetylene is tetramerized uniquely by arylmagnesium to a C 56H 40 hvdrocarbon for which the octaphenylcubane structure has been proposed. Synthesis of the cubane ring system cannot be duplicated when methyl or methyl-phenyl substituents are present on acetylene or various other organic groups on magnesium. The singular character of cubane synthesis on magnesium centers is related in a peculiar manner to an environment of aryl groups.
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