The angle strain induced by ring annulation on a spiro-type naphthofuran weakens its C(sp3)–O bond at the opposite peri-position and endows expandability, so that quite different bond lengths [1.493(3)–1.526(6) Å] are determined for the elongated C(sp3)–O bond of the corresponding spiro-acenaphthofuran derivative upon X-ray analyses of its pseudopolymorphs.
Y. Uchimura, T. Shimajiri, Y. Ishigaki, R. Katoono and T. Suzuki, Chem. Commun., 2018, 54, 10300 DOI: 10.1039/C8CC05998E
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