1,1-Diethylurea is primarily used as an intermediate in the synthesis of various organic compounds, particularly in the production of pharmaceuticals and agrochemicals. It plays a role in the development of active ingredients for drugs, where it can be utilized to modify the properties of the final product, such as enhancing solubility or stability. In agriculture, it is involved in the creation of herbicides and pesticides, contributing to the control of weeds and pests in crops. Additionally, it is sometimes employed in research and development for studying chemical reactions and mechanisms, aiding in the discovery of new compounds with potential industrial applications. Its versatility as a building block in organic synthesis makes it valuable in both commercial and experimental settings.