Add time:08/19/2019         Source:sciencedirect.com

Treatment of 6-amino-2-naphthoic acid with dichlorotriphenylphosphorane afforded a new naphthalene ring-based calix[3]amide in moderate yield. The macrocyclic calix[3]amide exists in an anti-form in the crystalline state and forms a channel structure along its b axis. In CDCl3 solution it exists in equilibrium between the syn- and anti-forms in solution (100:57). The energy barrier between the anti- to syn-forms was calculated to be 17.8 ± 0.2 kcal/mol.

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