4-Amino-1-indanone

4-Amino-1-indanone refers to CAS 51135-91-2 and molecular formula C9H9NO. The CAS resolves in PubChem to one compound, CID 22170214, titled 4-amino-2,3-dihydro-1H-inden-1-one. Rlavie’s shorter indanone name is included among the official synonyms for that CID. Both descriptions identify an amino-substituted fused benzocyclopentanone framework and close on the same neutral molecular entity.

The validated SMILES is C1CC(=O)C2=C1C(=CC=C2)N. It places the carbonyl inside the five-membered portion fused to benzene and attaches the amino group at aromatic position 4. PubChem lists InChIKey HCPYYLKYVRPDKI-UHFFFAOYSA-N, which is consistent with the full InChI stored on the page. Formula C9H9NO confirms a single nitrogen and oxygen, while the graph notation differentiates this locant arrangement from other aminoindanones.

CAS 51135-91-2, CID 22170214, and the complete PubChem title form a useful identity trio when the abbreviated 4-amino-1-indanone wording is encountered. A MOL or SDF drawing can be checked for the same fused junction, ring carbonyl, and amino-bearing aromatic atom. Agreement with the displayed SMILES and InChIKey then confirms the intended connection pattern. The two saturated carbons remain part of the five-membered ring in every matched representation. The catalog text remains confined to those identity facts and leaves other questions to separately documented evidence.