1. Professor of chemistry, Yale University, New Haven, CT 06511.
2. Celanese Specialty Operations, Corpus Christi, TX 78469.
3. Postdoctoral fellow in physical chemistry, University of Cambridge, Cambridge, England CB2 1EP.
4. Tennessee Eastman Company, Kingsport, TN 37662.
5. Postdoctoral fellow in chemistry, Lehigh University, Bethlehem, PA 18015.