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Automerization of an Enediyne via a Symmetrical p‑Benzyne Diradical Intermediate
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https://doi.org/10.1021/acs.joc.4c03144Abstract
Automerization is defined as a rearrangement reaction that yields a degenerate form of the starting material. We now report that cyclohexeno[3,4]cyclodeca-1,5-diyne-3-ene rearranges to its automer, via a D2h-symmetric p-benzyne intermediate. The NMR evidence is that when the enediyne is heated to 75 °C in DMSO with either LiI or NaNO3 as possible nucleophile, the enediyne is consumed only in the presence of LiI, whereas it remains "unchanged" in the presence of NaNO3.
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