On June 30, 2001, Mishriky, N.; Girgis, A. S.; Asaad, F. M.; Ibrahim, Y. A.; Sobieh, U. I.; Fawzy, N. G. published an article.Reference of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile The title of the article was Simple synthesis of condensed pyran containing compounds and their antimicrobial properties. And the article contained the following:
Reaction of various fused pyran compounds with formic acid was studied. Thus, refluxing 6-aminopyrano[2,3-c]pyrazole-5-carbonitriles with formic acid afforded the corresponding 3-aryl-3-(5-hydroxy-3-methyl-1H-pyrazole-4-yl)propanoic acids. Reaction of formic acid with 2-amino-4H-1-benzopyran-3-carbonitriles gave quinoline-2,5(1H,6H)-diones. The study was also extended toward spiro compounds possessing pyran residue. The antimicrobial properties of the prepared compounds was screened. The experimental process involved the reaction of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile(cas: 2510-01-2).Reference of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile
The Article related to fused pyran preparation antimicrobial property, Heterocyclic Compounds (More Than One Hetero Atom): General and other aspects.Reference of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts