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High-dilution conditions are not needed to bridge p-tert-butylcalix[6]arene with 2,6-bis(bromomethyl)pyridine giving the bimacrocycle 1 (R = H). The concave compund 1 can incorporate 4-nitrophenol but not 2,6-dimethyl-4-nitrophenol in its cavity, and catalyzes the addition of alcohols to diphenylketene.
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Ross et al. (1995) studied this question.
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