[1] Univ Aachen, Rhein Westfal TH Aachen, Inst Organ Chem, D-52074 Aachen, Germany
[2] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
[3] Freien Univ, Inst Chem & Biochem, D-14195 Berlin, Germany
[4] Univ Bonn, Inst Organ Chem & Biochem, D-53121 Bonn, Germany
[5] WWU Munster, Inst Organ Chem, D-48149 Munster, Germany