1. Wenzhou Institute University of Chinese Academy of Sciences Wenzhou 325001 P. R. China
2. State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China
3. Institute of Organic Chemistry University of Ulm Albert-Einstein-Allee 11 89081 Ulm Germany
4. Department of Chemistry Tsinghua University Beijing 100084 P. R. China