... 102574-25-4; 11,102574-26-5; 12,86646-59-5; 13,102574-27-6; 14, Homochiral Ketals in Organic Synthesis. ... Keith A. Nelson and Eugene A. Mash* Department of Chemistry, University of Arizona, Tucson, Arizona 85721 ... Page 2. Nelson and Mash 2722 J. Org. Chem., Vol. ...