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The deep cavity in the calix[6]arene framework provides a sterically shielded environment for the SeOH group of the selenenic acid 1. Thanks to this shielding the compound is extraordinarily stable—no decomposition was observed even after heating at 120°C for 5 h in CDCl2CDCl2—although the functional group is still reactive.
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Saiki et al. (1997) studied this question.
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