Facile and Highly Regiospecific Synthesis of 2-Aryl-Substituted Pyrazolidin-3-ones from α,β-Unsaturated N-Acylbenzotriazoles and Arylhydrazines - Wang, Xiaoxia; Wang, Wencun; Wen, Yihang; He, Liang; Zhu, Xiangming (Synthesis, 2008)