We describe the ion pair-driven heterodimeric capsule formation of a cyclotricatechylene 1 and a boronic acid-appended hexahomotrioxacalix[3]arene 2 . Although 1 does not interact with 2 in a protic solution, in the presence of Et 4 NAcO quantitative formation of a heterodimeric capsule via boronate esterification was observed in the NMR, a direct result of anion-induced boronate ester formation and the Et 4 N + template. Reversible boronate esterification allowed us to selectively control capsule assembly using pH switching.
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Kataoka et al. (2007) studied this question.
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