Synthesis of 2-amino-4-aryl-3-cyano-6-methyl-5-ethoxycarbonyl-4H-pyrans was written by Shestopalov, Anatoliy M.;Niazimbetova, Zukhra I.;Evans, Dennis H.;Niyazymbetov, Murat E.. And the article was included in Heterocycles in 1999.Safety of 2-(Anthracen-9-ylmethylene)malononitrile This article mentions the following:
A one-step electrochem. synthesis of the title compounds (I; R = Ph, 4-chlorophenyl, 3-nitrophenyl, 2-thienyl, 4-pyridyl) has been devised. The starting materials are aromatic and heteroaromatic aldehydes, malononitrile and Et acetoacetate. The overall reaction is catalyzed by electrogenerated base formed at a platinum cathode in acetonitrile. In the experiment, the researchers used many compounds, for example, 2-(Anthracen-9-ylmethylene)malononitrile (cas: 55490-87-4Safety of 2-(Anthracen-9-ylmethylene)malononitrile).
2-(Anthracen-9-ylmethylene)malononitrile (cas: 55490-87-4) belongs to nitriles. Nitrile compounds can be prepared by the incorporation of a cyanide source through C–C bond formation or by dehydration of primary carboxamides. Alkyl nitriles are sufficiently acidic to undergo deprotonation of the C-H bond adjacent to the CN group.Strong bases are required, such as lithium diisopropylamide and butyl lithium. The product is referred to as a nitrile anion. Safety of 2-(Anthracen-9-ylmethylene)malononitrile
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts