1. Department of Chemistry and Biochemistry Worcester Polytechnic Institute 100 Institute Road Worcester MA 01609 USA
2. Département de Chimie Université du Québec à Montréal Case Postale 8888 Succursale Centre-Ville Montréal Québec H3 C 3P8 Canada
3. Gustaf H. Carlson School of Chemistry Clark University 950 Main Street Worcester MA 01610 USA
4. Current Address: Department of Process Research & Development Discovery Process Chemistry MRL, Merck & Co., Inc. 770 Sumneytown Pike West Point PA 19486 USA