1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Xindu Rd. 8, Chengdu, Sichuan 610500, P. R. China
2. Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory, SE-106 91 Stockholm, Sweden
3. Department of Chemistry, Fudan University, Shanghai 200438, China
4. State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032, China
5. Tianfu Yongxing Laboratory, Chengdu, Sichuan 610000, China