N(CH₃)₄, also known as tetramethylammonium, is a quaternary ammonium compound. It consists of a nitrogen atom bonded to four methyl groups (CH₃). This structure gives it unique properties, making it soluble in water and various organic solvents. Tetramethylammonium is often used in chemical synthesis and as a phase transfer catalyst. It can also serve as a reagent in organic chemistry, facilitating reactions that involve the transfer of ions or molecules between different phases, such as liquid and solid states. Its applications extend to areas like biochemistry and pharmaceutical research.