The dimerization of precocene II with different Lewis acids has been studied. Besides C22H32O6 dimeric products, two further dimers, containing a tetrahydrofuran ring, were isolated and their structures established by spectroscopic and X-ray analysis. Since the furans were formed in the presence of SiO2–AgNO3 or SiO2–FeCl3 and not with SiO2–ZnBr2, it is possible that they arise by one-electron-transfer oxidation.
B. M. Fraga, V. P. García, A. G. González, M. G. Hernandez, J. R. Hanson and P. B. Hitchcock, J. Chem. Soc., Perkin Trans. 1, 1983, 2687 DOI: 10.1039/P19830002687
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