Campaigne, E.; Subramanya, R.; Maulding, Donald R. published an article in 1963, the title of the article was Ring closure of ylidenemalononitriles. II. Steric effect of a ring at the β position.Synthetic Route of 2510-01-2 And the article contains the following content:
cf. CA 58, 4481b. Heating 1-indanylidenemalononitrile in concentrated sulfuric or polyphosphoric acid yielded the I. Using similar conditions, ring closure of 1-benzosuberylidenemalononitrile to II was effected. Structural assignment on the basis of the infrared and ultraviolet spectra of these and related compounds was given. The experimental process involved the reaction of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile(cas: 2510-01-2).Synthetic Route of 2510-01-2
2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile(cas:2510-01-2) belongs to nitriles. Some nitriles are manufactured by heating carboxylic acids with ammonia in the presence of catalysts. This process is used to make nitriles from natural fats and oils, the products being used as softening agents in synthetic rubbers, plastics, and textiles and for making amines.Synthetic Route of 2510-01-2
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts