Phenyl- and naphthyl-dioxolanes are stereoselectively isomerised using titanium tetrachloride in methylene dichloride at –78 °C into benzo- and naphtho-pyrans.
R. G. F. Giles, I. R. Green, L. S. Knight, V. R. Lee Son, R. W. Rickards and B. S. Senanayake, J. Chem. Soc., Chem. Commun., 1991, 287 DOI: 10.1039/C39910000287
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