N-Methyl-N-propylpyrrolidinium Bromide (CAS: 608140-09-6) stands as a pivotal ionic liquid in the realm of advanced chemical synthesis and materials science. Known by various synonyms such as 1-Methyl-1-propylpyrrolidinium bromide and [C3MPr]Br, this compound, with its molecular formula C8H18BrN and molecular weight of 208.14 g/mol, is gaining increasing recognition for its unique properties and extensive applications.

As a quaternary ammonium salt, N-Methyl-N-propylpyrrolidinium Bromide typically appears as a white to off-white solid. Its melting point is reported around 107 °C, indicating its solid nature at room temperature. A defining characteristic of this compound, common among ionic liquids, is its remarkable thermal stability and exceptionally low volatility. These features make it a highly attractive alternative to traditional organic solvents, contributing significantly to more sustainable and environmentally friendly chemical processes, aligning perfectly with the principles of green chemistry.

The inherent ionic nature of N-Methyl-N-propylpyrrolidinium Bromide grants it excellent solvation properties for a wide array of polar and ionic compounds. This capability enhances its utility in various extraction and separation processes, leading to improved efficiency in chemical reactions. Furthermore, its wide liquid range ensures stability across diverse temperature conditions, broadening its applicability in demanding industrial environments.

The applications of N-Methyl-N-propylpyrrolidinium Bromide are diverse and impactful. It serves as a crucial synthesis material intermediate and a vital pharmaceutical raw intermediate, playing an indispensable role in the creation of complex organic molecules and active pharmaceutical ingredients. Beyond these areas, its utility extends significantly into the field of electrochemistry. It is increasingly employed as a key component in electrolytes for advanced battery technologies, including rechargeable lithium-oxygen (Li-O2) batteries, supercapacitors, and fuel cells. Research highlights its effectiveness as a bi-functional redox mediator, notably reducing over-potential during oxygen reduction and evolution reactions, which is vital for enhancing battery efficiency and longevity.

Moreover, N-Methyl-N-propylpyrrolidinium Bromide finds application as a functional fluid and additive. Its properties lend themselves to roles in lubricants, antistatic agents, and even in gas scrubbing processes. As a versatile solvent, it facilitates various organic synthesis reactions and is explored in polymer chemistry and biomass processing, demonstrating its adaptability across different chemical disciplines. Its potential for efficient metal recovery and carbon dioxide capture further solidifies its standing as a compound with considerable future promise.

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