Homophthalic anhydride
Homophthalic anhydride (CAS 703-59-3), with the molecular formula C9H6O3 and a molecular weight of 162.14 g/mol, is a chemical compound primarily recognised for its role as a monomer in polymer science and materials science. Its structure lends itself to various polymerisation reactions. This technical grade material is supplied by Tech Serve Solutions for research and industrial applications where its specific chemical properties are required. It is stored under refrigeration.
- IUPAC
- 1,3-Isochromandione,2-Carboxyphenylacetic anhydride
- Synonyms
- 1,3-Isochromandione,2-Carboxyphenylacetic anhydride

Polymerisation Monomer
Homophthalic anhydride serves as a valuable monomer in the synthesis of specialised polymers. Its reactive anhydride group allows for copolymerisation with various other monomers, leading to materials with tailored properties for advanced applications.
Materials Science Research
This compound is utilised in materials science research for developing novel materials. Its incorporation into polymer chains can influence thermal stability, mechanical strength, and chemical resistance of the final product.
Organic Synthesis Intermediate
As an anhydride derivative, homophthalic anhydride can act as an intermediate in complex organic synthesis pathways. It offers a reactive site for introducing specific functionalities into target molecules.
| Molecular weight | 162.14 |
|---|---|
| Empirical formula | C9H6O3 |
| Grade | technical grade |
| Storage temperature | 2-8°C |
| Impurities tested | 25% 3,4:8,9-dibenzooxacyclodecane-2,6,10-trione |
| Melting point | 140-142 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Homophthalic anhydride used for?
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Homophthalic anhydride is primarily used as a monomer in polymer science and materials science, and as an intermediate in organic synthesis.
What are the CAS number and formula for Homophthalic anhydride?
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The CAS number for Homophthalic anhydride is 703-59-3, and its empirical formula (Hill notation) is C9H6O3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Homophthalic anhydride as a technical grade material. The data indicates a significant impurity of 25% 3,4:8,9-dibenzooxacyclodecane-2,6,10-trione. We do not represent this product as USP, BP, or EP grade.
What are the main hazards associated with Homophthalic anhydride?
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Homophthalic anhydride is classified with the GHS07 symbol and carries a 'Warning' signal word. It causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Appropriate personal protective equipment, including a dust mask (N95), eyeshields, and gloves, should be used, and work should be conducted in a well-ventilated area.
How is Homophthalic anhydride packed, shipped, and exported?
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Homophthalic anhydride is stored at 2-8°C. For shipping and export, it is packaged according to industry standards to maintain product integrity and comply with international regulations. Please contact us for specific export details.
How can I request a sample or quote for Homophthalic anhydride?
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To request a sample or a quote for Homophthalic anhydride, please use the contact form on our website or reach out to our sales team directly. Please specify the quantity and your delivery location.
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