"The Study of Phosphoramidite as O-Phosphitylation Agent and Its Reactivity " Phosphorus, Sulfur and Silicon and the Related Elements, 2000 , vol. 164, p. 277 - 292 Chen, Shui-Bing; Li, Yan-Mei; Luo, Shi-Zhong; Zhao, Gang; Tan, Bo; Zhao, Yu- Fen Link: http://www.tandfonline.com/doi/pdf/10.1080/10426500008045253 my email: j******[email protected] Thank you very much!