4-Chlorobutyric acid methyl ester, also known as methyl 4-chlorobutyrate or Methyl (R)-4-chloro-3-hydroxybutyrate, is a colorless liquid that is commonly used as a versatile intermediate in the production of numerous organic compounds. It has a molecular weight of 166.61 g/mol and a CAS number of 3153-37-5. As a highly reactive ester, 4-Chlorobutyric acid methyl ester is widely used in chemical synthesis to produce a variety of pharmaceuticals, agrochemicals, and fragrances. It is used as an intermediate in the production of acetylcholine inhibitors, which are used in the treatment of Alzheimer's disease; as well as amoxicillin, an antibiotic commonly used to treat infections. Moreover, this compound is used as a reagent in the synthesis of a wide range of organic compounds such as β-ketoesters, β-diketones, and β-lactones. It has also been used as a starting material for the synthesis of chiral building blocks and to produce flavors and fragrances due to its characteristically estery smelling properties. Overall, 4-Chlorobutyric acid methyl ester is a highly versatile compound that is used for a variety of applications in different industries. Its unique chemical properties and versatile applications make it an essential compound in the chemical industry.

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