Description

Cresol Red Tetraoctylammonium Salt Sol.& CAS NO 157731-24-3 is a high-purity, non-aqueous acid-base indicator salt, specifically formulated for use in organic and non-polar solvent systems. This compound is critical for precise pH endpoint detection in titrations where aqueous indicators are ineffective. It is an essential reagent for analytical chemists and quality control laboratories in the pharmaceutical, chemical manufacturing, and advanced materials sectors.

Application

• Non-Aqueous Titration Indicator: Primary use as a visual or photometric endpoint indicator for acid-base titrations in organic solvents like methanol, ethanol, and DMSO.
• Pharmaceutical Analysis: Used in the assay of active pharmaceutical ingredients (APIs) and raw materials that are insoluble in water, following pharmacopeial methods (e.g., USP, EP).
• Chemical Synthesis Monitoring: Employed to monitor reaction progress and endpoint determination in synthetic organic chemistry processes.
• Polymer & Petrochemical Industry: Facilitates the determination of acid or base numbers in polymers, lubricants, and hydrocarbon-based products.
• Research & Development: Serves as a key reagent in method development for novel analytical procedures in non-aqueous media.
• Quality Control Laboratories: Essential for in-house QC testing of chemicals, ensuring batch-to-batch consistency and purity specifications.

Basic Information

Product Name	Cresol Red Tetraoctylammonium Salt Sol.& CAS NO 157731-24-3
CAS No.	157731-24-3
Molecular Formula	C₄₇H₇₂N₂O₅S
Molecular Weight	777.14 g/mol
Synonyms	Cresol Red TOA Salt; Tetraoctylammonium Cresolsulfonephthalein; o-Cresolsulfonephthalein Tetraoctylammonium Salt; 3',3''-Bis(methyl-hydroxy-phenyl)-5',5''-diisopropyl-2',2''-dimethylphenolsulfonephthalein Tetraoctylammonium Salt; Cresol Red Ion Pair; Non-aqueous Cresol Red Indicator; TOA Salt of Cresol Red; Cresol Red - Tetraoctylammonium complex
EINECS	Contact for details

Quality Control

Our Cresol Red Tetraoctylammonium Salt is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation (IR, NMR), to ensure it meets precise specifications for use in sensitive analytical applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). The product is light-sensitive (store away from light) and compatible with strong alkali/organic solvent environments, but the container must be kept sealed to prevent moisture absorption and contamination.

Specification

Item	Specification
Appearance	Dark red to purple crystalline powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0 %
Solubility	Freely soluble in common organic solvents (methanol, ethanol, DMSO)
Transition Interval (in methanol)	pH 7.2 (yellow) to 8.8 (red)

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