Phenylacetone, also known as 2-phenylpropan-2-one, is an organic compound with the chemical formula C9H10O. It appears as a colorless to pale yellow liquid and has a sweet, floral odor. This compound is primarily used in the synthesis of various pharmaceuticals and fragrances, making it an important intermediate in organic chemistry. In addition to its industrial applications, phenylacetone is also known for its role in the illicit production of methamphetamine. Due to its potential for misuse, it is regulated in many countries, and its production and distribution are closely monitored to prevent illegal activities.