5-Hydroxynonanoic acid, lactone, identified by the CAS number 3301-94-8 and commonly known as delta-nonalactone, is a cyclic ester that serves as a vital component in the flavor and fragrance industries. This organic compound is characterized by its distinct creamy, milky, and coconut-like aroma, which provides a rich sensory profile to various formulations. Physically, it typically presents as a colorless to pale yellow liquid that is soluble in alcohol and oils but has limited solubility in water.
In industrial and research settings, this lactone is valued for its chemical stability and its role as a versatile building block. It is often synthesized through the cyclization of hydroxy acids or the oxidation of specific precursors to ensure high purity. Proper handling requires standard safety measures, including storage in airtight containers away from heat and strong oxidizing agents, to preserve its olfactory characteristics and prevent degradation over time.