Unexpected Reactions of Push-Pull N-Heterocyclic Carbene Derived from N-(4-Methoxyphenyl)-N-(4-nitrophenyl)-imidazolium Chloride - Zhu, Zhi-Qiang; Jiang, Ming-Yue; Lin, Jin-Hong; Zhang, Cheng-Pan; Hang, Xiao-Chun; Zheng, Chang-Ge; Chen, Qing-Yun; Xiao, Ji-Chang (Synlett, 2009)