title: Synthesis of new functionalized calix[n]phyrin macrocycles with varied ring sizes by using a sterically congested dipyrromethane.
abstract: Congest and conjugate: The application of a sterically congested dipyrromethane in an acid-catalyzed [2+2+2] building-block approach was studied for the first time, resulting in the formation of two stable calix[6]phyrin(1.1.1.1.1.1) diastereomers (see scheme). The calix[n]phyrins were further functionalized at their pentafluorophenyl residues, allowing the first synthesis of a calix[4]phyrin(1.1.1.1) dimer.
authors.affiliation: Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany.
authors.forename: M Hassan
authors.initials: MH
authors.lastname: Beyzavi
authors.forename: Dieter
authors.initials: D
authors.lastname: Lentz
authors.forename: Hans-Ulrich
authors.initials: HU
authors.lastname: Reissig
authors.forename: Arno
authors.initials: A
authors.lastname: Wiehe