An important intermediate en route to antikekulene is the C30H6 hydrocarbon 1 d. A precursor for this intermediate is l a, which can be protodesilylated; but in contrast to 1 a–1 c, 1 d cannot yet be obtained in pure state. An X-ray crystal structure of 1 c confirms the high symmetry of the compound.
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Green et al. (1992) studied this question.
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