Citation: M. Ohno et al., PhI(OAc)(2)-promoted rearrangement of the hydroxyl group: Ring expansion of 4-hydroxy-2-cyclobutenone to 2(5H)-furanone in comparison with ring cleavage of the alpha-hydroxycycloalkanone to the omega-formyl ester, J ORG CHEM, 64(25), 1999, pp. 8995-9000