Diphenylphosphinic acid, with the CAS number 1707 - 03 - 5, is a high - quality chemical product. It has a molecular formula of C₁₂H₁₁O₂P. The molecular weight is approximately 218.19 g/mol. This product typically appears as a white to off - white powder. It has relatively stable chemical properties under normal storage conditions. The melting point of diphenylphosphinic acid is around 193 - 195 °C. It is sparingly soluble in water but can dissolve in some organic solvents such as ethanol and acetone.
Diphenylphosphinic acid has a wide range of applications in various industries. In the field of flame retardants, it can be used as an important raw material. It can endow polymers with excellent flame - retardant properties. For example, when added to plastics like polyesters and polyamides, it can significantly reduce the flammability of these materials, which is crucial for ensuring fire safety in many industrial and consumer products. In the pharmaceutical industry, it may serve as an intermediate for the synthesis of certain drugs. Its unique chemical structure allows it to participate in specific chemical reactions, facilitating the construction of complex drug molecules. Additionally, in the field of organic synthesis, diphenylphosphinic acid can be used as a catalyst or a ligand, promoting the progress of various chemical reactions and improving reaction efficiency.
When using diphenylphosphinic acid, proper safety measures should be taken. First, wear appropriate personal protective equipment, such as gloves and safety glasses, to prevent direct contact with the skin and eyes. When handling the product in a laboratory or industrial environment, ensure good ventilation to avoid inhalation of dust. For applications in flame - retardant formulations, it is usually necessary to mix it evenly with the polymer matrix. The mixing ratio needs to be determined according to the specific requirements of the final product, usually ranging from a few percent to a certain proportion. In organic synthesis, it should be added in accordance with the reaction conditions and stoichiometry. Precise weighing and control of the addition rate are essential to ensure the smooth progress of the reaction. After use, seal the remaining product properly and store it in a cool, dry place away from heat sources and direct sunlight.
Case 1: Flame - retardant plastic products. A plastic manufacturing company planned to produce flame - retardant polyester sheets for construction applications. They added diphenylphosphinic acid to the polyester resin during the melting and mixing process. By adjusting the addition ratio to 5%, they found that the limiting oxygen index (LOI) of the resulting polyester sheets increased from the original 20% to 28%, which met the fire - safety requirements for building materials. The mechanical properties of the sheets were also maintained at a satisfactory level, indicating that diphenylphosphinic acid could effectively improve the flame - retardant performance without significantly affecting the physical properties of the plastic.
Case 2: Pharmaceutical synthesis. A research team was synthesizing a new type of anti - cancer drug. They used diphenylphosphinic acid as an intermediate in a key step of the synthesis process. Through a series of chemical reactions, diphenylphosphinic acid participated in the formation of a specific functional group in the drug molecule. After purification and testing, they found that the presence of the functional group formed with the help of diphenylphosphinic acid enhanced the anti - cancer activity of the drug, demonstrating its important role in pharmaceutical research and development.
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