1. Key Laboratory of Organofluorine ChemistryCenter for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
2. University of Oxford, OxfordChemistry Research Laboratory 12 Mansfield Road Oxford OX1 3TA UK
3. Shanghai Institute of Organic ChemistryChinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China