1. Department of Chemistry, University of California-Riverside, Riverside, California 92521-0403 (C.K., T.A.S., C.L.W.); ICI Specialties, P.O. Box 42, Hexagon House, Blackley, Manchester M9 3DA, United Kingdom (D.C., G.D., P.J.); and ICI Wilton Research Centre, P.O. Box 90, Wilton Middlesbrough, Cleveland TS6 8JE, United Kingdom (J.C.)