Description

3-Ethyl-5-Methoxy-2-Methylbenzothiazolium p-Toluenesulphonate is a high-purity organic salt primarily used as a key intermediate in the synthesis of advanced functional materials. Its value lies in its role as a precursor for cyanine dyes and other specialized chromophores, which are critical for high-performance imaging and sensing applications. This compound is essential for manufacturers and R&D teams in the photographic, optical data storage, and biomedical diagnostics sectors who require reliable, high-quality intermediates for sensitive chemical processes.

Application

• Cyanine Dye Synthesis: A crucial precursor for manufacturing heptamethine and other cyanine dyes used in fluorescence labeling.
• Optical Recording Media: Used in the production of light-sensitive layers for CD-R, DVD-R, and other optical data storage technologies.
• Biomedical Imaging: Serves as an intermediate for near-infrared (NIR) fluorescent probes and contrast agents used in bioimaging and diagnostic assays.
• Photographic Sensitizers: Employed in the formulation of advanced photographic emulsions and sensitizing dyes for silver halide films.
• Laser and Nonlinear Optics: A building block for organic compounds with applications in laser dyes and nonlinear optical (NLO) materials.
• Academic and Industrial R&D: Used in research laboratories for developing new photonic materials and studying charge-transfer complexes.

Basic Information

Item	Detail
Product Name	3-Ethyl-5-Methoxy-2-Methylbenzothiazolium p-Toluenesulphonate
CAS No.	42379-68-0
Molecular Formula	C18H21NO4S2
Molecular Weight	379.49 g/mol
Synonyms	3-Ethyl-5-methoxy-2-methylbenzothiazolium tosylate; 2-Methyl-3-ethyl-5-methoxybenzothiazolium p-toluenesulfonate; 5-Methoxy-3-ethyl-2-methylbenzothiazolium tosylate; Benzothiazolium, 3-ethyl-5-methoxy-2-methyl-, salt with 4-methylbenzenesulfonic acid (1:1); Cyanine dye intermediate; Heptamethine cyanine precursor; Tosylate salt of 3-ethyl-5-methoxy-2-methylbenzothiazolium
EINECS	Contact for details

Quality Control

Our 3-Ethyl-5-Methoxy-2-Methylbenzothiazolium p-Toluenesulphonate is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets the high-purity standards required for sensitive synthesis applications. Certificates of Analysis (COA) documenting purity, identity, and impurity profiles are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at 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	Yellow to orange crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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