Home Chemical • Download Chemical Processes with Participation of Biological and by T.N. Lomova, G.E. Zaikov PDF

Download Chemical Processes with Participation of Biological and by T.N. Lomova, G.E. Zaikov PDF

By T.N. Lomova, G.E. Zaikov

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Extra info for Chemical Processes with Participation of Biological and Related Compounds.

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Herewith, it was found that, along with the formation of the vinyl group, there occurs the closing of the anhydride exocycle in compound 90, which leads to the recovery of the main spectral band Qy to the region of 783 nm. Interestingly, if the reaction was performed in chloroform, the product was obtained as free acid 90a, whereas addition of methyl or ethyl alcohols directly to the reaction medium led to the rapid etherification of propionic acid residue to form respective methyl 90b or ethyl 90c esters.

Of chlorophyll chemistry, Nobelist R. Willstätter [25]. He introduced the term “allomerization” for the autooxidation process, which is catalyzed by bases [26]. It is established at present that the mechanism of allomerization includes the formation of enol in the pentanone ring, which is then oxidized to form lactone (unstable chlorin), which, in turn, is transformed into the anhydride cycle conjugated with the chlorin macrocycle (purpurine 18). The occurrence of the exocycle, leading to an increase of the conjugation chain in the molecule, causes a batochromic shift of the absorption bands Qx (545 nm) and Qy (818 nm) and the emergence of a purple-red stain, with which the name of the compound (purpurine) is associated [26].

A. G. V. V. A. L. G. P. A. F. A. S. , 17, 1121–1123 (2003). 77. O. G. A. G. V. N. A. F. B. S. Sobolev, Mol. Meditsina, 4, 43–47 (2005) (in Russian). A. F. S. A. I. Koifman Ivanovo State University of Chemistry and Technology, 1 F. ru Methods of synthesis of meso-mono-, di-, three- and tetraphenylporphyrins as well as methods of introducing the supplement substituents and their further modification are considered. Possible ways for fine regulation of the physicochemical properties of porphyrins are shown.

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