Used as a solvent in organic synthesis, particularly in reactions where deuterium labeling is required. It is employed in nuclear magnetic resonance (NMR) spectroscopy as a deuterated solvent to avoid interference from hydrogen signals. Also utilized in the preparation of deuterated compounds for research in chemistry and biochemistry. Plays a role in studying reaction mechanisms by tracing deuterium atoms. Applied in the pharmaceutical industry for the development of deuterated drugs, which can have improved metabolic stability and efficacy.