The Elusive beta-unsubstituted calix[5]pyrrole finally captured.
[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.
Cafeo
Grazia
G
Dipartimento di Chimica Organica e Biologica, Università di Messina, Salita Sperone 31, I-98166 Messina, Italy.
Kohnke
Franz H
FH
Parisi
Melchiorre F
MF
Pistone Nascone
Rosetta
R
La Torre
Giovanna L
GL
Williams
David J
DJ