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The Elusive beta-unsubstituted calix[5]pyrrole finally captured
Grazia Cafeo1, Franz H Kohnke, Melchiorre F Parisi
1Dipartimento di Chimica Organica e Biologica, Università di Messina, Salita Sperone 31, I-98166 Messina, Italy.
Organic Letters
|August 3, 2002
Abstract:
[reaction: see text] The meso-decamethyl-calix[5]pyrrole 2b was synthesized from the furan-based analogue 1b via the homologation of the furan rings to pyrrole, and its solid-state structure was determined by X-ray crystallography: surprisingly, the binding constant of 2b toward chloride is found to be lower than that of the tetrameric analogue 2a.