• Crossed aldol condensations with acetals are promoted by Lewis acids, e.g. TiCl4 to give ?-alkoxy ketones: Chem. Lett., 323 (1974).
• Enol acetate of acetone. Other carbonyl compounds can be converted to their enol acetates by exchange; see, e.g.: J. Org. Chem., 30, 2502 (1965).
• For the (2 + 2) photochemical cycloaddition with isophorone, see: Org. Synth. Coll., 6, 1024 (1988).