Calix[n]aryl esters 2n(n= 4 and 6) bearing two stable N–O·radicals on the lower rim are synthesized: in 26 the exchange interaction (El) changes in response to a metal-induced 1,2,3-alternate-to-cone conformational change but in 24 the metal-induced rotation of the carbonyl groups is not enough to change the El.
K. Araki, R. Nakamura, H. Otsuka and S. Shinkai, J. Chem. Soc., Chem. Commun., 1995, 2121 DOI: 10.1039/C39950002121
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