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Six of the final cyclobutadiene rings in angular [8]phenylene and [9]phenylene (1) are closed in an unprecedented cobalt-catalyzed triple cyclization of appropriate nonaynes. These strained products are the largest known phenylenes and display unusual configurational lability. Their synthesis has enabled a first estimate of the properties of the hypothetical polyheliphene.
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Han et al. (2002) studied this question.
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