title: Synthesis of huge macrocycles using two calix[4]arenes as templates.
abstract: Macrocycles with up to 100 atoms have been synthesised using two calix[4]arenes as templates: first, (3,5-dialkenyloxy)phenyl groups are attached to the wide rim of a calix[4]arene via urea links, then the alkenyl groups are connected via a metathesis reaction using a tetratosylurea calix[4]arene for their correct prearrangement and finally the urea functions are cleaved to detach the newly formed macrocycles.
authors.affiliation: Abteilung Lehramt Chemie, Fachbereich Chemie, Pharmazie und Geowissenschaften, Johannes Gutenberg - Universität, Mainz, Germany.
authors.forename: Yudong
authors.initials: Y
authors.lastname: Cao
authors.forename: Leyong
authors.initials: L
authors.lastname: Wang
authors.forename: Michael
authors.initials: M
authors.lastname: Bolte
authors.forename: Myroslav O
authors.initials: MO
authors.lastname: Vysotsky
authors.forename: Volker
authors.initials: V
authors.lastname: Böhmer