Calixarenes with exo-hydroxy groups: Synthesis, crystal and molecular structure of ortho-tert-butylphenol-based calix[4]-, calix[6]- and calix[8]arenes
作者:Giovanni Sartori、Cecilia Porta、Franca Bigi、Raimondo Maggi、Francesco Peri、Elena Marzi、Maurizio Lanfranchi、Maria Angela Pellinghelli
DOI:10.1016/s0040-4020(97)00039-2
日期:1997.3
Ortho-tert-butylcalixarenes 3, 4 and 5 with exo-hydroxy groups were synthesised by tin tetrachloride-promoted condensation of 2,2′-dihydroxy-3,3′-di-tert-butyldiphenylmethane 6 with formaldehyde. While 1H NMR analysis of compounds 3, 4 and 5 revealed a considerable annular flexibility in CDCl3 solution, their X-ray single crystal analysis showed the presence of a strong intramolecular hydrogen bonds
通过四氯化锡促进2,2'-二羟基-3,3'-二叔丁基二苯基甲烷6与甲醛的缩合反应,合成具有外羟基的邻叔丁基杯芳烃3、4和5。尽管化合物3、4和5的1 H NMR分析显示在CDCl 3溶液中具有相当大的环形柔韧性,但它们的X射线单晶分析表明在近端OH基团之间存在强分子内氢键。