1. Organisch-Chemisches
Institut, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer
Feld 270, 69120 Heidelberg, Germany
2. Department
of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
3. Chemistry
Department, Faculty of Science, King Abdulaziz University (KAU), Jeddah 21589, Saudi Arabia