FORMATION OF A NOVEL DIPYRROLOPYRROLE MEDIATED BY A 1,4-DIAZA-1,3-DIENE COMPLEX OF IRON

The dipyrrolopyrrole 4,7-tri-p-tolyl-1H-dipyrrolo[3,2-b:2',3'-d]pyrrol e (1) was obtained from the reaction of a 1,4-diaza-1,3-diene, glyoxal bis(p-tolylimine), in the presence of FeCl2. Crystals of 1, C43H32N5, are triclinic, space group, P1BAR, with a = 10.014(3) angstrom, b = 1 3.212(3) angstrom, c = 13.710(3) angstrom, alpha = 106.31(2)degrees, b eta = 95.79(2)degrees, gamma = 105.77(2)degrees, V = 1644 A3 , Z = 2, D(cald) = 1.211 g cm-1, R = 0.026, and R(w) = 0.057. The compound is t hought to result from a series of metal-mediated condensations of the 1,4-diaza-1,3-diene precursor.