83-08-9 Quinophthalone 1H-Indene-1,3(2H)-dione, 2-(2-quinolinyl)- 2-(2-Quinolyl)-1H-indene-1,3(2H)-dione Quinophthalone (VAN) (8CI) 11641 Yellow EINECS 201-453-9 Erio Chinoline Yellow 4G NSC 18950 Quinoline Yellow 2SF 2-(2-Quinolyl)-1,3-indandione 2-(2-Quinolyl)-1,3-indanedione CAS 83-08-9

Purity 97%+In StockPharmaceutical Standards
CAS No.83-08-9
Molecular FormulaC18H11NO2
Molecular Weight273.29 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

83-08-9 Quinophthalone 1H-Indene-1,3(2H)-dione, 2-(2-quinolinyl)- 2-(2-Quinolyl)-1H-indene-1,3(2H)-dione Quinophthalone (VAN) (8CI) 11641 Yellow EINECS 201-453-9 Erio Chinoline Yellow 4G NSC 18950 Quinoline Yellow 2SF 2-(2-Quinolyl)-1,3-indandione 2-(2-Quinolyl)-1,3-indanedione CAS 83-08-9 chemical structure

Description

83-08-9 Quinophthalone 1H-Indene-1,3(2H)-dione, 2-(2-quinolinyl)- 2-(2-Quinolyl)-1H-indene-1,3(2H)-dione Quinophthalone (VAN) (8CI) 11641 Yellow EINECS 201-453-9 Erio Chinoline Yellow 4G NSC 18950 Quinoline Yellow 2SF 2-(2-Quinolyl)-1,3-indandione 2-(2-Quinolyl)-1,3-indanedione (CAS 83-08-9), molecular formula C18H11NO2 and molecular weight 273.29 g/mol, is a CATO reference standard with documented purity and traceability.

The molecular framework of 83-08-9 Quinophthalone 1H-Indene-1,3(2H)-dione, 2-(2-quinolinyl)- 2-(2-Quinolyl)-1H-indene-1,3(2H)-dione Quinophthalone (VAN) (8CI) 11641 Yellow EINECS 201-453-9 Erio Chinoline Yellow 4G NSC 18950 Quinoline Yellow 2SF 2-(2-Quinolyl)-1,3-indandione 2-(2-Quinolyl)-1,3-indanedione (C18H11NO2) is characterized by a steroid core, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.

Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

Molecular FormulaC18H11NO2
Molecular Weight273.29 g/mol
AppearancePale yellow to yellow crystalline powder
Purity97%+
StorageStore at 2-8°C, protect from light
Solubility (reference)Soluble in chloroform, dichloromethane, ethyl acetate, DMSO
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)14.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1957
Nitrogen Atoms1

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