Used as a reagent in organic synthesis, particularly in the preparation of oximes and other nitrogen-containing compounds. It serves as a selective protecting group for carbonyl functionalities due to its ability to form stable derivatives with aldehydes and ketones. Commonly employed in pharmaceutical synthesis for intermediate transformations, especially in routes involving amine or hydroxylamine chemistry. Its hydrochloride salt form enhances stability and solubility in polar solvents, making it suitable for reactions under acidic conditions. Also utilized in analytical chemistry for the detection and purification of carbonyl compounds.