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Abstract
The meso-rhodin ester 1 and acid 2 as well as their corresponding ferric forms 3 and 4 have been characterized by UV, IR, 1H NMR and FAB mass spectrometry. All these species are synthesized as equimolar mixtures of two isomers (6- or 7-propionic acid condensed into ring). Some separation of the isomers of 1 can be achieved by semipreparative HPLC. The 300 MHz 1H NMR of the biscyano complexes of both 3 and 4 show almost all resonances for both isomers. A resonance for the α-CH 2 of the exocyclic ring is seen at >20 ppm. The FAB mass spectra indicated electron capture by the macrocyclic ring or Fe(III) atom.
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