On May 5, 2008, Wang, Xiang-Shan; Wu, Jian-Rong; Li, Qing; Yao, Chang-Sheng; Tu, Shu-Jiang published an article.Reference of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile The title of the article was A novel and green method for the synthesis of indeno[2,1-c]pyridine derivatives in ionic liquid catalyzed by malononitrile. And the article contained the following:
1-Aryl-9H-indeno[2,1-c]pyridine-4-carbonitrile derivatives, e.g., I, were unexpectedly obtained from the reaction of 2-(2,3-dihydroinden-3-ylidene)malononitrile (II), aldehydes (such as 4-tolualdehyde), and malononitrile in ionic liquid at 90 °C. Modification of the novel reaction protocol resulted in a two-component reaction between II and aryl and heteroaryl aldehydes catalyzed by 10 mol% malononitrile. A 1,5-hydrogen transfer was proposed to occur in the formation of the product. 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 dihydroindenylidene malononitrile aryl aldehyde malononitrile catalyst heterocyclization, aryl indenopyridine carbonitrile derivative preparation, ionic liquid green chem heterocyclization solvent and other aspects.Reference of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts