MnII/O2-oxidation products of α,ω-dimethyldipyrrins

A alpha,omega-dimethyidipyrrin with and without a meso-situated phenyl substituent has been investigated as the substrate in the oxidation reaction with the Mn-II/O-2 system. While for the meso-phenyldipyrrin, the expected, though impure and sensitive diformyl derivative is formed, the reaction of the meso unsubstituted dipyrrin leads to a novel tripyrrolic species, the alpha-(vinylpyrrolyl)dipyrrin, as the only isolable product. The new tripyrrole displays positive solvatochromic behavior and has been investigated with respect to this property. Copyright (C) 2007 Society of Porphyrins & Phthalocyanines.