3,4-Dihydroxybenzoic acid
3,4-Dihydroxybenzoic acid (CAS 99-50-3) is a phenolic acid with the linear formula (HO)2C6H3CO2H and a molecular weight of 154.12 g/mol. This organic compound serves as a valuable building block in chemical synthesis. It is commonly utilised in the development of pharmaceuticals and other complex organic molecules. Available from Tech Serve Solutions, it meets rigorous quality standards for laboratory and research applications.
- IUPAC
- Protocatechuic acid
- Synonyms
- (HO)2C6H3CO2HProtocatechuic acid

Pharmaceutical Intermediate
3,4-Dihydroxybenzoic acid is employed as a precursor in the synthesis of various active pharmaceutical ingredients (APIs). Its chemical structure lends itself to modifications for developing new therapeutic agents.
Organic Synthesis Building Block
This compound functions as a versatile building block for constructing more complex organic molecules. It is frequently used in academic and industrial research settings for novel compound development.
Laboratory Reagent
Utilised in research laboratories for a variety of analytical and synthetic procedures. Its properties make it suitable for specific chemical reactions and studies.
| Molecular weight | 154.12 |
|---|---|
| Linear formula | (HO)2C6H3CO2H |
| Assay | 97% |
| Grade | Vetec™ reagent grade |
| Melting point | 197-200 °C (dec.)(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
| 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 3,4-Dihydroxybenzoic acid primarily used for?
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3,4-Dihydroxybenzoic acid is primarily used as a building block in organic synthesis and as an intermediate in the development of pharmaceuticals. It is also employed as a laboratory reagent.
What is the CAS number and chemical formula for 3,4-Dihydroxybenzoic acid?
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The CAS number for 3,4-Dihydroxybenzoic acid is 99-50-3, and its linear formula is (HO)2C6H3CO2H.
What grade and purity does Tech Serve Solutions supply for 3,4-Dihydroxybenzoic acid?
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Tech Serve Solutions supplies 3,4-Dihydroxybenzoic acid in Vetec™ reagent grade with an assay of 97%.
How should 3,4-Dihydroxybenzoic acid be handled safely?
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3,4-Dihydroxybenzoic acid is classified as an irritant. Handle with appropriate personal protective equipment, including gloves and eye protection. Avoid inhalation of dust and ensure adequate ventilation. Refer to the safety data sheet for detailed handling instructions.
Does Tech Serve Solutions export 3,4-Dihydroxybenzoic acid?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 3,4-Dihydroxybenzoic acid, serving customers worldwide.
How can I request a sample or quote for 3,4-Dihydroxybenzoic acid?
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To request a sample or a quote for 3,4-Dihydroxybenzoic acid, please contact our sales department through the website or by phone, providing your specific requirements.
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