Indanedione

1,3-Indandione

Names
IUPAC name indane-1,3-dione
Other names Indandione; 1,3-Diketohydrindene; 1,3-Dioxoindane; 1,3-Hydrindendione
Identifiers
CAS Number	606-23-5 Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	11322 Y
ECHA InfoCard	100.009.191
PubChem CID	11815
InChI InChI=1S/C9H6O2/c10-8-5-9(11)7-4-2-1-3-6(7)8/h1-4H,5H2 Y Key: UHKAJLSKXBADFT-UHFFFAOYSA-N Y InChI=1/C9H6O2/c10-8-5-9(11)7-4-2-1-3-6(7)8/h1-4H,5H2 Key: UHKAJLSKXBADFT-UHFFFAOYAR
SMILES C1C(=O)C2=CC=CC=C2C1=O O=C2c1ccccc1C(=O)C2
Properties
Chemical formula	C9H6O2
Molar mass	146.15 g·mol−1
Appearance	Yellow solid
Density	1.37 g / cm3
Melting point	129 to 132 °C (264 to 270 °F; 402 to 405 K)
Solubility in water	slight
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

1,3-Indandione (indanedione) is an organic compound with the molecular formula C₉H₆O₂. Chemically, it is a β-diketone. In standard conditions it is referred to in different sources as either a colorless or yellowish, green, or (most commonly) yellow solid.

In the solid state, 1,3-indandione occurs as a diketone; in water, it is partially (~2%) enolized. The enolate anion exhibits significant delocalization, and the highest electron density is on the second carbon. This explains many of chemical properties of the compound.

1,3-Indandione can be prepared by decarboxylation of the sodium salt of 2-ethoxycarbonyl-1,3-indandione, which itself is obtained by Claisen condensation of ethyl acetate and dimethyl phthalate.

1,3-Indandione is a very strong C-nucleophile. It undergoes self-condensation quite easily, resulting in bindone.

Bromination occurs at the 2-position:

1,3-Indandione could be reduced to indanone, 3-hydroxy-1-indanone, 1,3-indanediol or even indane, depending on the method used.

The related compound 1,2-indandione is used in the first stage of forensic identification of latent fingerprints. It is particularly useful for paper, and for items printed with thermal inks such as receipts. Amino acids left behind by the human hand may be developed into fingerprints by the use of it; the results, photographed with a special filter under a strong yellow-green fluorescent or green laser. It is usually the first method employed in a sequential analysis aimed at the production of evidence of a grade suitable for use in the courtroom. Nivimedone is an antiallergen.