Convenient Synthesis of Novel Tetra-bridged Biscalix[4]tube and 1,2-3,4-Bis-bridged Calix[4]arene
Zhang Yingmei, Yang Fafu, Bai Xiaoyan, Liu Zhiqiang, Guo Hongyu
Chin. J. Org. Chem. . 2012, (12): 2350 -2353 .  DOI: 10.6023/cjoc201207012