Cyclization of tetrapyrrolic 1,19-dibromo-1,19-dideoxybiladiene-ac dihydrobromides with sodium azide was dramatically improved by application of a phase transfer agent to give nearly quantitative yields of monoazaporphyrins.
Synthesis and basic properties of 5-aza-2,3,7,8,12,13,17,18-octamethylporphyrin
作者:Yu. B. Ivanova、Yu. I. Chyrakhin、A. S. Semeikin、R. S. Kumeev、N. Zh. Mamardashvili
DOI:10.1134/s1070363208100265
日期:2008.10
5-Aza-2,3,7,8,12,13,17,18-octamethylporphyrin was synthesized and its basic properties were studied by means of spectrophotometric titration. Protonation of nitrogen atoms in the tetrapyrrolic macrocycle with the ethanolic sulfuric acid is found to be a two-step process. Corresponding ionization constants and the concentration ranges of existence of mono- and dicationic forms of the azaporphyrin under investigation are evaluated.
Fischer; Mueller, Justus Liebigs Annalen der Chemie, 1937, vol. 528, p. 1,3,7