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

✍ Scribed by Giovanni Sartori; Cecilia Porta; Franca Bigi; Raimondo Maggi; Francesco Peri; Elena Marzi; Maurizio Lanfranchi; Maria Angela Pellinghelli

Publisher: Elsevier Science
Year: 1997
Tongue: French
Weight: 709 KB
Volume: 53
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(97)00039-2

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✦ Synopsis

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 tH NMR analysis of compounds 3, 4 and 5 revealed a considerable annular flexibility in CDCI3 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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