1. Albert-Ludwigs-Universität Freiburg, Institute of Organic Chemistry, Albertstraße 21, 79104 Freiburg, Germany
2. Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106 Braunschweig, Germany
3. Albert-Ludwigs-Universität Freiburg, Institute of Inorganic and Analytical Chemistry, Albertstraße 21, 79104 Freiburg, Germany
4. Technische Universität Braunschweig, Institute of Inorganic and Analytical Chemistry, Hagenring 30, 38106 Braunschweig, Germany