1. American Chemical Society National Meeting, Washington, D. C. – August 2005.
2. American Chemical Society National Meeting, New York, N.Y- August-1991.
3. XVII ICCC, Queensland, Australia, July 1989.
4. XXV ICCC, Nanjing, China, August 1987.
5. 30th IUPAC Conference, Manchester, U. K., September 1985.

6.   The First Conference on Mechanisms of Reactions in Solutions, Kent, U.K., July 1979.