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Phthaloyl chloride reacts with the 1,4-bis-nucleophiles 3 to give spiro[4.4] lactones 7 and 9 and with the 1,5-bis-nucleophiles 10 to give spiro[4.5] lactones 12, as proved by X-ray crystallography, and not the 8- and 9-membered heterocyclic systems previously claimed.
M. J. O’Mahony, E. A. Saville-Stones, C. W. Rees, E. A. Saville-Stones, A. J. P. White and D. J. Williams, Chem. Commun., 1998, 1459 DOI: 10.1039/A802630K
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