2-(4-Chlorobenzoyl)benzoic acid
2-(4-Chlorobenzoyl)benzoic acid (CAS: 85-56-3), with the linear formula ClC₆H₄COC₆H₄CO₂H, is a key organic intermediate with a molecular weight of 260.67 g/mol. This compound serves as a valuable building block in chemical synthesis, particularly in the preparation of specialised monomers. Its carboxylic acid and carbonyl functionalities allow for diverse reactivity in organic chemistry.

Synthesis of Bisphthalazinone Monomers
2-(4-Chlorobenzoyl)benzoic acid is employed in the synthesis of bisphthalazinone monomers. These monomers are essential precursors for creating advanced polymers with phthalazinone units.
Polymer Chemistry
The resulting phthalazinone-containing polymers, such as poly(arylene ether)s, poly(arylene thioether)s, and poly(arylene sulfone)s, benefit from the unique properties imparted by the incorporated monomer structure derived from this benzoic acid derivative.
Organic Synthesis Building Block
As a versatile organic building block, it facilitates complex molecular construction due to its reactive functional groups, making it useful in various research and development applications.
| Molecular weight | 260.67 |
|---|---|
| Linear formula | ClC6H4COC6H4CO2H |
| Assay | 98% |
| Application | 2-(4-Chlorobenzoyl)benzoic acid was used in the preparation of bisphthalazinone monomers, required for the synthesis of phthalazinone containing poly(arylene ether)s, poly(arylene thioether)s and poly(arylene sulfone)s1. |
| Melting point | 149-150 °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 2-(4-Chlorobenzoyl)benzoic acid used for?
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2-(4-Chlorobenzoyl)benzoic acid is primarily used as a building block in organic synthesis, notably for preparing bisphthalazinone monomers which are then used in the synthesis of various polymers like poly(arylene ether)s, poly(arylene thioether)s, and poly(arylene sulfone)s.
What is the CAS number and formula for 2-(4-Chlorobenzoyl)benzoic acid?
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The CAS number for 2-(4-Chlorobenzoyl)benzoic acid is 85-56-3, and its linear formula is ClC₆H₄COC₆H₄CO₂H.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2-(4-Chlorobenzoyl)benzoic acid with an assay of 98%. We do not represent this product as USP, BP, EP, or any pharmacopoeia grade; it is supplied for research and chemical synthesis purposes.
What are the safety and handling precautions for 2-(4-Chlorobenzoyl)benzoic acid?
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This compound is classified with GHS07 symbol and a 'Warning' signal word. It causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Use a dust mask type N95 (US), wear eyeshields and gloves. Ensure adequate ventilation and avoid breathing dust. Wash hands thoroughly after handling.
How is 2-(4-Chlorobenzoyl)benzoic acid packed, shipped, and exported?
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2-(4-Chlorobenzoyl)benzoic acid is carefully packed in compliance with international shipping regulations and exported globally by Tech Serve Solutions. Specific packaging details are available upon request for bulk orders.
How can I request a sample or quote for 2-(4-Chlorobenzoyl)benzoic acid?
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To request a sample or a detailed quotation for 2-(4-Chlorobenzoyl)benzoic acid, please contact our sales department through the website or direct email, providing your specific requirements.
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