Durch säurekatalysierte Kondensation von o‐Nitrobenzaldehyd (I) und Pyrrol (II) wird das Tetra(o‐nitrophenyl‐)porphyrin (IIIa) erhalten und in das Tetraaminoderivat (IIIb) übergeführt, das zunächst als Gemisch von vier Atropisome‐ ren in 95% Ausb. anfällt.
Pyrazine derivatives
Pyrazine derivatives R 0550Synthesis and Reactions of 1,6-Dibenzoyl-5H,10H-diimidazo[1,5-a;1',5'-d]-pyrazine-5,10-dione. -The use of dichloride (I) for Friedel-Crafts acylation is studied for the first time. The product (III) is used as starting material for the synthesis of a variety of derivatives, e.g. the new heterocyclic system (IX). -(IVANOV, Y. E.; YAVOLOVSKY, A. A.; MAZEPA, A. V.; KRASNOSHCHEKAYA, S. P.; Chem.
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