... LANTHANIDE CATALYSIS OF CYCLOADDITIONS OF HETERODIENES WITH ENOL ETHERS Samuel Danishefsky* and Mark Bednarski Department of Chemistry, Yale University, New Haven, CT 06511 Abstract: The cycloadditions of enol ethers with c~,@-unsaturated aldehydes is catalyzed by Yb C fod ) ~. ... (Received in USA 8 November 1983). References. 1. M. Bednarski, S. Danishefsky. J. Am. Chem. Soc., 105 (1983), p. 3716. 2. ...