Abstract
The ortho- tert-butylphenol derived calix[4]arene 5 with the OH groups arranged in a extra-annular fashion is synthesized by condensation of 2,2′-dihydroxy-3,3′-di- tert-butyldiphenylmethane 4 with formaldehyde under BF 3Et 2O catalysis. The crucial role of tert-butyl groups in promoting the macrocyclization process is emphasized.
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