Description

4-Hydroxyphthalic Acid is a versatile aromatic dicarboxylic acid derivative, distinguished by the presence of a phenolic hydroxyl group on the phthalic acid backbone. This unique bifunctional structure makes it a valuable intermediate for synthesizing complex molecules with tailored properties. It is particularly sought after by research and development teams in the pharmaceutical and advanced materials sectors for creating novel compounds, dyes, and polymer precursors.

Application

• Pharmaceutical Intermediate: Key building block for the synthesis of active pharmaceutical ingredients (APIs), especially those with complex aromatic structures.
• Dye and Pigment Synthesis: Serves as a precursor for manufacturing high-performance organic dyes, pigments, and colorants.
• Polymer Chemistry: Used in the production of specialty polyesters, polyamides, and epoxy resin hardeners, imparting specific thermal or chemical resistance.
• Ligand and Chelating Agent: Functions as a starting material for creating complexing agents and ligands used in catalysis and metal ion sequestration.
• Agrochemical Research: Employed in the development of new herbicides, fungicides, and plant growth regulators.
• Fine Chemical Synthesis: A versatile synthon for organic chemists in academic and industrial research laboratories.

Basic Information

Product Name	4-Hydroxyphthalic Acid
CAS No.	501666-22-4
Molecular Formula	C8H6O5
Molecular Weight	182.13 g/mol
Synonyms	4-Hydroxybenzene-1,2-dicarboxylic Acid; 1,2-Benzenedicarboxylic Acid, 4-Hydroxy-; 4-Carboxy-2-hydroxybenzoic Acid; 2-Hydroxyterephthalic Acid (isomer); 4-Hydroxyisophthalic Acid (isomer); 4-Hydroxy-o-phthalic Acid
EINECS	Contact for details

Quality Control

Our 4-Hydroxyphthalic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via IR spectroscopy, to ensure it meets precise customer specifications and industry benchmarks. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept tightly sealed after opening to minimize exposure to atmospheric moisture and light, which can affect product stability.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm

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