Unsymmetrical capped porphyrin dimers are prepared by coupling two alkynyl monomer units to a central core, followed by intramolecular cyclisation of the alkynes; the approach is illustrated by the synthesis of an unsymmetrical trimer with a ‘small’ cavity and of a dimer equipped with a chiral binaphthyl cap.
A. Vidal-Ferran, C. M. Müller and J. K. M. Sanders, J. Chem. Soc., Chem. Commun., 1994, 2657 DOI: 10.1039/C39940002657
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