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An efficient, green and novel protocol is described for high yield synthesis of N-confused meso-tetraspirocyclohexyl calix[4]pyrrole. In aqueous solution, the condensation of pyrrole and cyclohexanone in the presence of Brønsted acidic ionic liquid catalysts afforded N-confused calix[4]pyrrole in up to 62.5% yield which represents a ∼threefold yield improvement over existing protocol and makes significant...
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