1. Departments of Chemistry and Chemical Engineering, Michigan State University, East Lansing, Michigan 48824, Chemical Process Research and Development, Pharmacia Corporation, 1500-91-2, 7000 Portage Road, Kalamazoo, Michigan 49001-0199, and Analytical Research and Development, Pharmacia Corporation, 1140-230-4, 7000 Portage Road, Kalamazoo, Michigan 49001-0199