Abstract
WHEN two resonant systems can be linked by a methine bridge to form a single degenerate system, it is usually found that the methine bridge can be replaced by a bridge consisting of a single nitrogen atom, the resulting aza compound being at least as stable as the methine itself ; the progressive replacement of the methine bridges in the porphins to form aza-porphins, and finally phthalocyanines, being an interesting example. It is therefore surprising that, despite the numerous examples of the class 5: 5'-dipyrromethine (I, X = CH), there is no record of a 5: 5'-aza-dipyrromethine (I, X = N).
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ROGERS, M. Tetra-arylazadipyrromethines: a New Class of Synthetic Colouring Matter. Nature 151, 504 (1943). https://doi.org/10.1038/151504a0
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DOI: https://doi.org/10.1038/151504a0
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