4-Methylphthalic acid
4-Methylphthalic acid (CAS 4316-23-8), with the molecular formula CH3C6H3-1,2-(CO2H)2 and a molecular weight of 180.16 g/mol, is a dicarboxylic acid. This compound serves as a valuable building block in materials science and polymer chemistry. Its structure allows for its use as a monomer in the synthesis of various polymers and resins, contributing to their unique properties.
- Synonyms
- 2-(Carboxy)toluene-1-carboxylic acid4-Methylbenzene-1,2-dicarboxylic acidToluene-2,3-dicarboxylic acid

Polymer Synthesis
4-Methylphthalic acid acts as a monomer in the creation of polyesters and other polymers. It can be incorporated into polymer backbones to modify properties such as thermal stability and mechanical strength.
Organic Synthesis Intermediate
This compound is a useful intermediate in the synthesis of more complex organic molecules. Its reactive carboxylic acid groups can undergo various chemical transformations for further functionalization.
Materials Science Research
Researchers utilise 4-Methylphthalic acid in the development of novel materials. Its specific chemical structure can lead to unique properties in advanced materials and functional polymers.
| Molecular weight | 180.16 |
|---|---|
| Linear formula | CH3C6H3-1,2-(CO2H)2 |
| Assay | 99% |
| Melting point | 146-148 °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) | 26-37/39 |
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 4-Methylphthalic acid used for?
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4-Methylphthalic acid is primarily used as a monomer in polymer synthesis and as an intermediate in organic chemistry, particularly within materials science research for developing new polymers and materials.
What are the CAS number and chemical formula for 4-Methylphthalic acid?
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The CAS number for 4-Methylphthalic acid is 4316-23-8, and its linear chemical formula is CH3C6H3-1,2-(CO2H)2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Methylphthalic acid with an assay of 99%. We do not represent this product as USP, BP, EP, or pharmacopoeia grade.
How should 4-Methylphthalic acid be handled safely?
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Handle 4-Methylphthalic acid with appropriate personal protective equipment, including a dust mask (type N95 or equivalent), eyeshields, and gloves. Ensure adequate ventilation and avoid breathing dust. In case of eye contact, rinse cautiously with water for several minutes, removing contact lenses if present and easy to do.
Is 4-Methylphthalic acid a controlled substance?
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The provided data does not indicate that 4-Methylphthalic acid is a controlled substance.
How is 4-Methylphthalic acid packed and shipped?
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4-Methylphthalic acid is typically packed in secure containers suitable for chemical transport. Tech Serve Solutions exports chemicals globally, adhering to relevant shipping regulations.
How can I request a sample or quote for 4-Methylphthalic acid?
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To request a sample or a quote for 4-Methylphthalic acid, please contact our sales team through the website or by phone, providing your specific requirements.
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