Affiliation: | 1. Organisch‐Chemisches Institut der Universit?t Münster, Corrensstrasse 40, 48149 Münster (Germany), Fax: (+49)?251‐833‐6503;2. Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S?3H6 (Canada) http://www.chem.utoronto.ca/staff/DSTEPHAN |