Calixarenes 11. Crystal and molecular structure of p-tert-butylcalix [8] arene

摘要: Monoclinic prisms were obtained by slow evaporation of a pyridine solution ofp-tert-butylcalix[8]arene: space groupP21/c,a=20.312(3),b=23.020(2),c=20.006(6) A; β=113.05(2)0;V=8707.6 A3;Z=4. Refinement led to anR value 0.166 for 4231 reflections which, although high, is sufficient establish the conformation molecule as pleated loop in which eight hydroxyl groups are arranged slightly undulating, almost planar, intramolecularly hydrogen bonded cyclic array. The possible inferences ofp-tert-butylcalix[8]arene discussed.