1. Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science Soochow University, Suzhou 215123, P. R. China
2. Yonghua Chemical Co., Ltd., Xiangqiao Village,
Zhitang (heshi) Town, Changshu 215500, P. R. China
3. School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453000, P. R. China