Synthesis of huge macrocycles using two calix[4]arenes as templates
Literature Information
Yudong Cao, Leyong Wang, Michael Bolte, Myroslav O. Vysotsky, Volker Böhmer
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.
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