The smallest [2n]metacyclophan-n-yne known to date is the title compound 1. It was synthesized from the precursor tetraenes by bromination/dehydrobromination and is stable at room temperature. According to an X-ray structure analysis, 1 is nearly planar and the alkyne units are slightly bent (167.7–169.9°).
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Kawase et al. (1996) studied this question.
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