Sathyamoorthi, Govindarao published the artcileLaser active cyanopyrromethene-BF2 complexes, Product Details of C7H8N2, the publication is Heteroatom Chemistry (1994), 5(4), 403-7, database is CAplus.
Treatment with a mixture of formic and hydrobromic acids converted Et 3,4-diethyl-5-methylpyrrole-2-carboxylate to 3,3,’,4,4′-tetraethyl-5,5′-dimethylpyrromethene hydrobromide presumably via the condensation of α-unsubstituted and α-formylpyrrole intermediates formed in situ. The corresponding 6-cyanohexaalkylpyrromethane was obtained by the addition of hydrogen cyanide to the pyrromethene and was oxidized with bromine to an unstable pyrromethene, an intermediate converted to 1,2,6,7-tetraethyl-3,5-dimethyl-8-cyanopyrromethene-BF2 complex(PM-TEDC), λlas (plastic) 613-639 nm, in a reaction with boron trifluoride etherate. Et 3,4,5-trimethylpyrrole-2-carboxylate was similarly converted to 1,2,3,5,6,7-hexamethyl-8-cyanopyrromethene-BF2 complex, (PM-HMC), λlas (plastic) 615-639 nm. Immediately after formation by a condensation between propionyl chloride and 2,4-dimethyl-3-cyanopyrrole, unstable 3,3′,5,5′-tetramethyl-6-ethyl-4,4′-dicyanopyrromethene hydrochloride was treated with boron trifluoride etherate to give 1,3,5,7-tetramethyl-2,6-dicyano-8-ethylpyrromethene-BF2 complex, λlas (ethanol) 540-565 nm.
Heteroatom Chemistry published new progress about 26187-28-0. 26187-28-0 belongs to nitriles-buliding-blocks, auxiliary class Pyrrole,Nitrile, name is 2,4-Dimethyl-1H-pyrrole-3-carbonitrile, and the molecular formula is C7H8N2, Product Details of C7H8N2.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts