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By oxidative coupling of the lithiated allene 1, the title compound 2 is formed in several stereoisomeric forms. One of them cyclizes rapidly in a conrotatory ring closure to give 3, another cyclizes slowly to give 4, which was characterized by an X-ray structure analysis. Aryl = 2,4,6-tBu3C6H2.
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Märkl et al. (1990) studied this question.
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