Abstract
The results are given from CNDO/2 quantum-chemical calculations of the electronic structure of the intermediate products in the reduction of porphyrins (the anions of phlorins) and the final reaction products (porphodimethenes). A comparison is made of the calculated charge distribution with the experimental chemical shifts of the protons in the NMR spectra. The contributions from the total electron density at the carbon atoms, the -electron density, and the electron density at the proton to the formation of the chemical shift of the protons in the NMR spectra are analyzed.
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