One-Pot Syntheses of Calix[4]-bis-crowns and Biscalix[4]crown with Two Kinds of Bridging Chains
Ye Jinqi, Yang Fafu, Zhang Xiaoyi, Jiao Ziyu, Guo Hongyu
Chin. J. Org. Chem. . 2012, (01): 189 -192 .  DOI: 10.6023/cjoc1105292