3,4-Dihydroxybenzaldehyde contains two phenolic hydroxyl groups, giving it acidic properties. It can undergo acid-base neutralization reactions with basic substances to form the corresponding salts. Because it contains two phenolic hydroxyl groups, it can participate in nucleophilic substitution reactions, such as reacting with haloalkanes to form esters and ethers. Furthermore, the aldehyde group is a highly reactive functional group that can readily transform into carboxyl groups, ester groups, and unsaturated double bonds, etc.

3,4-Dihydroxybenzaldehyde is used in organic synthesis; it is a pharmaceutical intermediate that can be used to synthesize various antibiotics and anti-inflammatory drugs. It has anti-inflammatory effects and increases coronary blood flow. It is an effective component of Ilex chinensis leaves for treating angina pectoris and one of the main effective components of Clematis armandii for treating nephritis. It is also used in fragrance synthesis.

Store in a cool, well-ventilated warehouse. The warehouse temperature should not exceed 37°C. Store separately from oxidizers and food chemicals; do not mix with other chemicals. Keep containers sealed. Keep away from sources of ignition and heat. The warehouse must be equipped with lightning protection devices. The exhaust system should have a grounding device to discharge static electricity. Use explosion-proof lighting and ventilation systems. Do not use equipment or tools that may generate sparks. The storage area should be equipped with spill response equipment and suitable containment materials. It is recommended that the work area be separated from other work areas. Operate in a closed system to prevent leaks. Enhance ventilation. Install automatic alarm devices and emergency ventilation facilities.

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