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4-(pyrrolidin-2-yl)phenol hydrochloride; CAS No.: 7167-72-8; 4-(pyrrolidin-2-yl)phenol hydrochloride. PROPERTIES: 4-(pyrrolidin-2-yl)phenol hydrochloride appears as a white to off-white crystalline powder with a slight ammoniacal odor. Its molecular formula is C9H13ClNO, corresponding to a molecular weight of approximately 192.66 g/mol. The compound exhibits a melting point in the range of 180-183 C and demonstrates moderate solubility in water and polar organic solvents such as methanol and ethanol. It is stable under normal laboratory conditions but should be protected from prolonged exposure to moisture and heat. Proper storage involves keeping it in a tightly sealed container at room temperature (15-25 C) in a dry environment. Safety considerations include wearing appropriate protective equipment as the compound may cause skin and eye irritation. Inhalation of dust should be avoided, and in case of accidental exposure, thorough washing with water and medical consultation is advised. APPLICATIONS: 4-(pyrrolidin-2-yl)phenol hydrochloride serves as a specialized intermediate in the synthesis of pharmaceuticals, particularly in the preparation of certain antidepressants and antipsychotics where its pyrrolidine and phenol groups provide structural features important for receptor binding and bioactivity (Journal of Medicinal Chemistry). In materials science, it functions as a building block for creating liquid crystal polymers and electro-optical materials, where its rigid aromatic structure and flexible pyrrolidine group enable desired mesomorphic properties and optical anisotropy (Journal of Polymer Science). Additionally, it finds application in the development of fluorescent probes and sensors, where its phenol moiety provides strong fluorescence quantum yield and its pyrrolidine group allows for selective labeling of biological targets (Analytical Chemistry). The compound is also employed in the synthesis of certain agrochemicals, though specific applications in this area are limited to non-agricultural research settings (Pest Management Science).