Organic compounds with a naphthalene ring and a substituent at the alpha position—the carbon atom next to one of the benzene rings—are known as alpha-naphthyl compounds. These substances have a variety of chemical and biological characteristics and are used in a number of industries, such as materials research, organic synthesis, and pharmaceuticals.Alpha-naphthylamine is a well-known illustration of an alpha-naphthyl compound. It is a main aromatic amine that is utilized in the production of medicines, antioxidants, and azo colors. Its use is forbidden in several countries due to its known carcinogenic properties.Alpha-naphthol is a significant alpha-naphthyl chemical. The adaptable substance alpha-naphthol is used as a precursor to create a variety of organic compounds, such as colors, cosmetics and medications. Additionally, it is utilized in biochemical tests like the α-naphthol reaction to identify phenols in organic substances.Specifically in immunohistochemistry and histopathology, enzymatic assays employ beta-naphthyl acetate (ANA) as a substrate to measure esterase activity. When esterases hydrolyze it, alpha-naphthol is produced, which can be further identified using colorimetric or fluorometric techniques.Furthermore, a substance called alpha-naphthyl isothiocyanate (ANITC) is employed in the production of fluorescent dyes and biomolecule labels. It forms persistent thiourea links by reacting with amino groups in proteins, peptides, or nucleic acids. These linkages can be used in a variety of bioconjugation procedures for labeling and detection. Alpha-naphthyl-based compounds have been investigated for their potential as organic semiconductors in the field of materials science. These materials are promising candidates for use in organic electronic devices, such as organic field-effect transistors (OFETs), organic light-emitting diodes (OLEDs), and organic photovoltaics (OPVs), because of their special electronic properties, which include high charge carrier mobility and tunable energy levels.All things considered, alpha-naphthyl compounds are a broad class of organic molecules having substantial applications in chemistry, biology, and materials science. Even though they are widely used, it's crucial to treat them carefully because some derivatives, such alpha-naphthylamine, may pose health risks.