CALIXARENES WITH EXO-HYDROXY GROUPS - SYNTHESIS, CRYSTAL AND MOLECULAR STRUCTURE OF ORTHO-TERT-BUTYLPHENOL-BASED CALIX[4]-, CALIX[6]- AND CALIX[8]ARENES

摘要

Orhto-tert-butylcalixnrenes 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 H-1 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 between the proximal OH groups. (C) 1997 Elsevier Science Ltd. [References: 35]