Description

4-Hydroxy-5-Methyl-Isophthalic Acid is a versatile aromatic dicarboxylic acid derivative, distinguished by its hydroxyl and methyl substituents which impart unique reactivity and physical properties. This compound is a critical high-purity intermediate for synthesizing advanced materials and fine chemicals, where precise molecular structure is paramount. It is primarily sought by R&D laboratories and manufacturers in the pharmaceutical, agrochemical, and specialty polymer industries for developing novel active ingredients and functional monomers.

Application

• Pharmaceutical Intermediate: Serves as a key building block for the synthesis of novel drug candidates, particularly in creating complex molecular scaffolds.
• Agrochemical Synthesis: Used in the research and production of advanced herbicides, fungicides, and plant growth regulators.
• Polymer & Material Science: Acts as a monomer or co-monomer for producing high-performance polyesters, polyamides, and liquid crystal polymers (LCPs).
• Dye & Pigment Manufacturing: Functions as a precursor for synthesizing specialized organic dyes and colorants.
• Coating & Resin Formulation: Incorporated into specialty coatings and resins to enhance properties like adhesion, chemical resistance, and thermal stability.
• Chemical Research (R&D): Utilized in academic and industrial research for exploring new organic reactions and catalytic processes.
• Chelating Agent Precursor: Its structure makes it suitable for developing ligands and chelating agents for metal ions.

Basic Information

Product Name	4-Hydroxy-5-Methyl-Isophthalic Acid
CAS No.	4365-31-5
Molecular Formula	C9H8O5
Molecular Weight	196.16 g/mol
Synonyms	5-Methyl-4-hydroxyisophthalic acid; 4-Hydroxy-5-methylbenzene-1,3-dicarboxylic acid; Isophthalic acid, 4-hydroxy-5-methyl-; 1,3-Benzenedicarboxylic acid, 4-hydroxy-5-methyl-; 5-Methyl-4-hydroxy-1,3-benzenedicarboxylic acid
EINECS	Contact for details

Quality Control

Our 4-Hydroxy-5-Methyl-Isophthalic Acid is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC, NMR, and IR spectroscopy, to ensure identity, purity, and consistency. We provide a detailed Certificate of Analysis (COA) with each shipment, documenting critical parameters such as assay, related substances, and residual solvents. Our quality commitment supports applications requiring high-purity intermediates for research and regulated synthesis.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Heavy Metals	≤ 20 ppm
Residue on Ignition	≤ 0.1%

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