[22]Porphyrin-(3.1.1.3), a New Vinylogous Expanded Porphyrin System<sup>†</sup>
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Acid-catalyzed condensation of a pyrrole bisacrylaldehyde with a tripyrrane, followed by oxidation with ferric chloride, gave a [22]porphyrin-(3.1.1.3). This stretched macrocycle shows a strong diamagnetic ring current by 1H NMR spectroscopy and gives red-shifted porphyrin-like UV−vis spectra; coordination with palladium(II) induces an EZ isomerization to accommodate the metal cation while retaining highly diatropic characteristics.
创建时间：
2006-10-26
