3,3′,4,4′-联苯四甲酸二酐，CAS号：2421-28-5

Introduction to 3.3′,4.4′-Benzophenonetetracarboxylic Dianhydride (BTDA)

3.3′,4.4′-Benzophenonetetracarboxylic dianhydride (BTDA) is a versatile chemical compound widely used in the synthesis of high-performance polymers and other advanced materials. With the chemical formula C17H6O7 and a molecular weight of 322.23 g/mol, BTDA is known for its excellent thermal stability and reactivity.

Property	Value
CAS Number	2421-28-5
Chemical Formula	C17H6O7
Molecular Weight	322.23 g/mol
Appearance	White to off-white powder
Melting Point	218°C – 222°C
Purity	>98.5%

Chemical Structure and Synthesis

BTDA is derived from benzophenone with two dianhydride groups on both terminals. Its chemical structure features a benzophenone core with four carboxylic anhydride groups, making it highly reactive in polymerization processes. The compound is typically synthesized through a series of reactions, including Diels-Alder reaction, methoxylation, Friedel-Crafts reaction, hydrolysis, and dehydration.

Applications

BTDA is primarily used as an intermediate in the synthesis of polyimides, which are known for their exceptional thermal stability and mechanical properties. These polyimides are used in various applications, including:

High-Performance Polymers:Used in the production of fibers, films, and coatings with high thermal and chemical resistance.

Photocatalytic Applications:BTDA-derived polyimides are used in photocatalytic dye degradation, such as methylene blue in water.

Organic Field-Effect Transistors (OFETs):BTDA-based polyimides serve as dielectric layers in high-performance OFET memory devices.

Safety and Handling

BTDA is classified as an irritant (Xi) with risk terms indicating it can cause irritation to eyes and the respiratory system (R36/37). It should be stored under dry conditions, preferably in an argon-filled environment to prevent moisture sensitivity. Safety measures include avoiding eye contact and ensuring proper ventilation during handling.

Conclusion

3.3′,4.4′-Benzophenonetetracarboxylic dianhydride (BTDA) is a crucial compound in the synthesis of high-performance polymers and advanced materials. Its unique chemical structure and excellent thermal stability make it an ideal choice for applications in high-temperature environments and advanced technologies. Whether you are developing new materials for electronics, aerospace, or environmental applications, BTDA offers a reliable and versatile solution

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