Ds. Black et al., SYNTHESIS AND CRYSTAL-STRUCTURE OF A CALIX[3]INDOLE WITH CONE CONFORMATION - A NEW MOLECULAR RECEPTOR, Tetrahedron letters, 37(2), 1996, pp. 241-244
A calix[3]indole with 2,7-linkages has been synthesised from an indoly
lglyoxylamide and shown by X-ray crystallography to have a cone or cup
shaped conformation and to contain a molecule of ethanol inside the c
up.