Waldemar Adama,b, Aimin Zhang*c a Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany b Department of Chemistry, Facundo Bueso 110, University of Puerto Rico, Rio Piedras, Puerto Rico 00931, USA e-Mail: wadam@chemie.uni-wuerzburg.de; e-Mail: wadam@adam.uprr.pr; c Department of Chemistry, NSC 815, New York State University at Buffalo, Buffalo, NY, 14260, USA e-Mail: azhang2@buffalo.edu;