| 26.11.1990 | Prof. William von Eggers Doering Harvard University, Cambridge, Massachusetts, USA |
| 18.11.1991 | Prof. Alan R. Battersby University of Cambridge, UK |
| 02.11.1992 | Prof. Elias Corey Harvard University, Cambridge, Massachusetts, USA Nobelpreisträger 1990 |
| 20.06.1994 | Prof. Günther Wilke Max-Planck-Institut für Kohlenforschung, Mühlheim/Ruhr |
| 19.06.1995 | Prof. Richard E. Smalley Rice University, Houston, Texas Nobelpreisträger 1996 |
| 17.06.1996 | Prof. Francois Diederich ETH Zürich, Schweiz |
| 04.05.1998 | Prof. Ronald Breslow Columbia University, New York, USA |
| 26.04.2000 | Prof. Ryoji Noyori Nagoya University, Japan Nobelpreisträger 2001 |
| 28.05.2001 | Prof. A. Eschenmoser ETH Zürich, Schweiz and Scripps Research Institute, La Jolla, California, USA |
| 27.05.2002 | Prof. K. C. Nicolaou Scripps Research Institute, La Jolla, California, USA |
| 28.06.2004 | Prof. Sason Shaik Hebrew University, Jerusalem, Israel |
| 26.06.2005 | Prof. Dale Boger Scripps Research Institute, Department of Chemistry, La Jolla, California, USA |
| 16.06.2006 | Prof. Robert H. Grubbs California Institute of Technology, California, USA Nobelpreisträger 2005 |
| 09.06.2008 | Prof. Masakatsu Shibasaki Tokyo University, Japan "Recent Progress in Asymmetric Two-Center Catalysis: Dynamic Structural Change of Chiral Rare Earth Complexes." |