1. Laboratorium für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
2. Laboratorium für Physikalische Chemie, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich, Switzerland
3. Institut de Quı́mica Computacional i Catàlisi (IQCC) and Departament de Quı́mica, Universitat de Girona, Maria Aurelia Capmany 69, 17003 Girona, Catalonia, Spain
4. Department of Chemistry, Purdue University Fort Wayne, Fort Wayne, Indiana 46805, United States
5. ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Catalonia, Spain