Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Adducts AlCl 3 .RCOC1 undergo highly regioselective self- and cross-condensation. 4-Hydroxy-2-pyrones and 2-acetyl-indan-1,3-diones are synthesized in good yields. ... J. Am. Chem. Soc., 111 (1989), p. 9123 and references therein. ... Even if the enolate 3 is a ...