4-Formylmorpholine is primarily used as a solvent in various chemical processes, particularly in the pharmaceutical and agrochemical industries. Its polar aprotic nature makes it suitable for reactions requiring high solvency power, such as peptide synthesis and polymer production. It is also employed as a catalyst or reaction medium in organic synthesis, facilitating the formation of complex molecules. Additionally, it finds application in the extraction and purification of certain compounds due to its ability to dissolve a wide range of substances. Its stability and low toxicity make it a preferred choice in industrial and laboratory settings.