F. Grynszpan et Se. Biali, LARGE MACROCYCLIC RINGS WITH COMPLEX ARCHITECTURES - POLYSPIRODIENONECALIX[6]ARENE DERIVATIVES, Journal of the Chemical Society, Chemical Communications, (22), 1994, pp. 2545-2546
Mild oxidation of p-tert-butylcalix[6]arene yields tris(spirodienone)
systems with alternant and non-alternant cyclic dispositions of the et
her and carbonyl groups.