Synthesis of a BF2 complex of indol-2-yl-isoindol-1-ylidene-amine: a fully conjugated azadipyrromethene

Starting from commercially available 3-methylindole and 1,3-diiminoisoindoline, the BF2 complex of indol-2-yl-isoindol-1-ylidene-amine (7) has been prepared in three steps; its wavelength of maximum visible absorption is similar to that of a tetra-phenyl-conjugated azadipyrromethene (4).

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