1. Department of Chemistry and Department of Chemical Engineering, Columbia University, 3000 Broadway, Mail Code 3119, New York, New York 10027, Joint Science Department, W.M. Keck Science Center, 925 North Mills Avenue, Claremont McKenna, Pitzer, and Scripps Colleges, Claremont, California 91711, Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg (Germany) and Department of Chemistry, University of Puerto Rico, Rio Piedras, Puerto Rico 00931, and ICORP (JST) and Department...