Synfacts, Table of Contents Synfacts 2012; 8(10): 1107DOI: 10.1055/s-0032-1317250 Metal-Catalyzed Asymmetric Synthesis and Stereoselective Reactions © Georg Thieme Verlag Stuttgart · New York Chemoselectivity at a Glance: Lewis versus Brønsted Acid Catalysis Contributor(s): Mark Lautens , Harald Weinstabl Recommend Article Abstract Buy Article Key words Key wordsintramolecular aldol reaction - cyclopentanones - ytterbium triflate - Lewis acids - Brønsted acids Full Text