Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
1. Basic Information
Name: 2,5-Dihydroxybenzaldehyde
Alias: Gentisaldehyde
CAS No.: 1194-98-5
Molecular Formula: C7H6O3
Molecular Weight: 138.12
2. Physical and Chemical Properties
Physical Properties
- Appearance: Light yellow to off-white crystalline powder
- Odor: Faint aromatic odor
- Solubility: Soluble in C2H5OH, CH3OH, acetone, CHCl3; slightly soluble in hot H2O; insoluble in alkanes
- Melting Point: 98–100 °C
- Hygroscopicity: Slightly hygroscopic under high humidity
- Aqueous characteristic: Weakly acidic aqueous solution
Chemical Properties
- Molecular Structure: Benzene ring with two -OH groups at 2,5 positions and one -CHO aldehyde group
- Aldehyde reactivity: Undergoes condensation, reduction, oxidation, Schiff base formation reactions
- Phenolic hydroxyl characteristic: Reacts with alkali to form soluble phenate; easily oxidized by air/UV to dark quinone impurities
- Thermal stability: Stable below 70 °C; long-term heating above melting point accelerates oxidative discoloration
- Photostability: Sensitive to ultraviolet light; long-term light exposure turns dark brown
- Compatibility: Incompatible with strong oxidants, heavy metal salts, concentrated alkaline solutions
3. Main Application Fields
1. Pharmaceutical Synthetic Intermediate (Core Application)
Raw material for synthesizing anti-inflammatory drugs, antioxidant agents and heterocyclic medicinal compounds
2. Dye & Pigment Intermediate
Precursor for preparation of mordant dyes, fluorescent colorants and color-developing agents
3. Biochemical Analytical Reagent
Chromogenic reagent for metal ion qualitative detection, HPLC reference standard
4. Organic Synthesis Raw Material
Building block for Schiff base ligands, polymer monomer modifiers
4. Quality Specification Table
| Test Item | Standard Index |
| CAS Number | 1194-98-5 |
| Molecular Formula | C7H6O3 |
| Appearance | Pale yellow crystalline powder |
| HPLC Purity | Synthetic Grade ≥99.0% |
| Water Content (KF) | ≤0.30% |
| Residue on Ignition | ≤0.10% |
| Single Unknown Impurity | ≤0.10% |
| Heavy Metals (Pb1) | ≤10 ppm |
| Packaging | Amber aluminum foil vacuum bag / 25kg PE lined fiber drum |
| Storage Condition | Hermetic cool dark warehouse below 25 °C; isolate from air, light and oxidants |
| Transportation Requirement | Oxidation-prone phenolic solid, light-proof sealed packaging |
| Shelf Life | 24 months under fully sealed packaging |
Safety Warning
Irritating phenolic compound. Dust irritates eyes, nasal mucosa and skin; long-term skin contact may cause allergic dermatitis. Wear dust mask, chemical-resistant gloves and protective goggles during operation with ventilation. Avoid long-term exposure to air and light to prevent oxidative darkening. Waste liquid needs neutralization treatment before discharge; solid waste belongs to organic hazardous waste for professional centralized disposal.
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