New core-expanded calix[4]pyrroles and N-donor-extended dipyrromethanes: syntheses, anion binding and conformational studies.

A series of dipyrromethane-based N-donor-extended dipodal receptors (2a-c) and meso-(1,3)-modified expanded calix[4]pyrroles (3a-c) were synthesized via Mannich reactions. While the two non-equivalent meso-substituents at the dipyrromethane unit(s) i…

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