Gt. Hwang et Bh. Kim, Ultramacrocycle with four calix[4]arenes: Synthesis and X-ray crystal structure of a quadruple calix[4]arene, SYN COMMUN, 30(23), 2000, pp. 4205-4212
A quadruple calix[4]arene has been synthesized efficiently from the known d
iaminocalix[4]arene and 4,4'-biphenyldisulfonyl chloride injust one step (3
8% yield). The compound has been fully characterized including the determin
ation of the X-ray crystal structure.