Phenol-3,5-D2 is primarily used in research and development, particularly in the field of organic chemistry and spectroscopy. Its deuterium-labeled structure makes it a valuable tool in studies involving isotopic labeling, where it helps trace reaction mechanisms and pathways. This compound is also utilized in nuclear magnetic resonance (NMR) spectroscopy as a reference or internal standard due to its distinct deuterium signals, aiding in the analysis of molecular structures and dynamics. Additionally, it finds applications in the synthesis of deuterated compounds, which are essential in various scientific investigations, including metabolic studies and pharmaceutical research.