Description

3,5-Dimethoxy-Phthalic Anhydride CAS NO 4670-17-1 is a versatile aromatic anhydride derivative characterized by its methoxy-substituted phthalic acid core structure. This compound serves as a critical high-purity building block in advanced organic synthesis, enabling the introduction of specific functional groups into complex molecules. It is primarily required by manufacturers in the pharmaceutical, agrochemical, and specialty polymer industries for the development of active ingredients, dyes, and advanced materials.

Application

• Pharmaceutical Intermediate: Key precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds requiring a substituted phthalimide or phthalamic acid moiety.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and plant growth regulators where its aromatic structure provides core stability.
• Dye and Pigment Manufacturing: Serves as a starting material for creating methoxy-substituted phthalocyanine dyes and other complex colorants.
• Polymer Chemistry: Acts as a monomer or cross-linking agent in the production of specialty polyimides and epoxy resins, enhancing thermal and chemical resistance.
• Chemical Research & Development: Employed in academic and industrial R&D labs for exploring new synthetic pathways and creating novel heterocyclic compounds.
• Material Science: Used in the surface modification of materials and in the synthesis of organic frameworks (MOFs/COFs) for catalytic or sensing applications.

Basic Information

Product Name	3,5-Dimethoxy-Phthalic Anhydride
CAS No.	4670-17-1
Molecular Formula	C10H8O5
Molecular Weight	208.17 g/mol
Synonyms	3,5-Dimethoxyphthalic Anhydride; 3,5-Dimethoxy-1,2-benzenedicarboxylic Anhydride; 1,3-Isobenzofurandione, 5,7-dimethoxy-; 5,7-Dimethoxyisobenzofuran-1,3-dione; 3,5-Dimethoxyphthalic Acid Anhydride; Phthalic Anhydride, 3,5-dimethoxy-; NSC 163044
EINECS	225-110-1

Quality Control

Our 3,5-Dimethoxy-Phthalic Anhydride is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing including HPLC, GC, and NMR to ensure identity, purity, and consistency. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing all specified parameters. Our quality commitment aligns with cGMP principles where applicable, ensuring reliability for critical synthesis applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect purity and reactivity. Keep away from incompatible materials such as strong bases and amines.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	158 - 162 °C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm
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.