Calixarenes with exo-hydroxy groups: Synthesis, crystal and molecular structure of ortho-tert-butylphenol-based calix[4]-, calix[6]- and calix[8]arenes-Science-Chemical Encyclopedia-lookchem

Calixarenes with exo-hydroxy groups: Synthesis, crystal and molecular structure of ortho-tert-butylphenol-based calix[4]-, calix[6]- and calix[8]arenes
Add time:07/23/2019 Source:sciencedirect.com

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 between the proximal OH groups.

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