Description

3,3-Bis(1-Ethyl-2-Methyl-1H-Indol-3-Yl)-4-Azaphthalide is a specialized leuco dye intermediate with a complex heterocyclic structure. This compound matters for its role as a key precursor in the synthesis of high-performance color formers used in pressure-sensitive and thermal recording systems. Industries involved in the manufacturing of specialty papers, carbonless copy paper, and thermal printing materials require this precise chemical building block to achieve specific color development properties.

Application

• Primary use as a color-forming leuco dye precursor in pressure-sensitive (carbonless) paper systems.
• Key intermediate in the production of thermal paper color developers for point-of-sale receipts, fax paper, and labels.
• Used in research and development of advanced chromogenic materials for imaging and sensing technologies.
• Potential application in the synthesis of functional dyes for specialized optical or electronic applications.
• Employed in the fine-tuning of color reaction sensitivity and hue in various recording media formulations.

Basic Information

Product Name	3,3-Bis(1-Ethyl-2-Methyl-1H-Indol-3-Yl)-4-Azaphthalide
CAS No.	50293-29-3
Molecular Formula	C₃₂H₃₁N₃O
Molecular Weight	473.61 g/mol
Synonyms	4-Azaphthalide, 3,3-bis(1-ethyl-2-methyl-1H-indol-3-yl)-; 3,3-Bis(1-ethyl-2-methylindol-3-yl)phthalide; ODB-4 Precursor; Leuco Dye Intermediate 50293-29-3; 3,3-Bis(1-ethyl-2-methyl-3-indolyl)phthalide; 3,3-Bis(1-ethyl-2-methyl-1H-indol-3-yl)-1(3H)-isobenzofuranone; 1(3H)-Isobenzofuranone, 3,3-bis(1-ethyl-2-methyl-1H-indol-3-yl)-
EINECS	Contact for details

Quality Control

Our production of 3,3-Bis(1-Ethyl-2-Methyl-1H-Indol-3-Yl)-4-Azaphthalide adheres to stringent internal quality standards to ensure batch-to-batch consistency and high purity for sensitive applications. Each lot is analyzed using advanced chromatographic and spectroscopic techniques. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Off-white to light yellow crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 1.0%
Related Substances (HPLC)	Total impurities ≤ 2.0%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.