Used as a key intermediate in the synthesis of fluorescent dyes and optical brighteners due to its strong electron-donating and light-absorbing properties. Commonly employed in the development of sensors for detecting metal ions and pH changes in solution, thanks to its distinct color shift upon protonation or coordination. Also utilized in organic synthesis for constructing heterocyclic compounds, particularly in the preparation of amino-substituted aromatic systems through reductive amination or condensation reactions. Its aldehyde group allows for easy functionalization in Schiff base formation, making it valuable in coordination chemistry and medicinal chemistry research.