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NMR spectra of porphyrins. 18. A ring-current model for chlorophyll derivatives

✍ Scribed by Abraham, Raymond J.; Smith, Kevin M.; Goff, Dane A.; Lai, Jan Ji


Book ID
123609208
Publisher
American Chemical Society
Year
1982
Tongue
English
Weight
809 KB
Volume
104
Category
Article
ISSN
0002-7863

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The NMR spectra of porphyrins: 22—Ring c
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## Abstract The proton NMR spectra of tetraphenylporphyrin, octaethylporphyrin and the analogous chlorins (7,8‐dihydroporphyrins) are presented, and the chemical shift changes on chlorin formation are interpreted using a ring current model. In these compounds a general 10% reduction in the ring cur

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## Abstract The equivalent dipole model of the ring current shift in benzene is shown to be equivalent to that of the well‐known two current loop calculation. A network model of the ring current effect in the porphyrin system is described, using the double–dipole approximation, to give a calculatio

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## Abstract The facile preparation of zinc(II) __meso__‐tetraphenylporphyrin (Zn TPP) and derivatives from substituted benzaldehydes and pyrrole, combined with the calculation of ring current shifts in these molecules, provides a useful series of selective diamagnetic shift reagents. The porphyrin‐