CAS 940-58-9

4-Methoxyphenyl chlorothioformate, with the CAS number 940-58-9, is an organic compound characterized by its functional groups, including a methoxy group (-OCH3) and a chlorothioformate moiety. This compound typically appears as a colorless to pale yellow liquid and is known for its reactivity, particularly in nucleophilic substitution reactions due to the presence of the chlorothioformate group. It is often used as a reagent in organic synthesis, particularly in the formation of thioesters and in the preparation of various derivatives of phenolic compounds. The methoxy group enhances the electron density on the aromatic ring, influencing its reactivity and stability. Additionally, 4-methoxyphenyl chlorothioformate may exhibit moderate toxicity, necessitating careful handling and appropriate safety measures during its use in laboratory settings. Its applications extend to the fields of medicinal chemistry and agrochemicals, where it serves as an intermediate in the synthesis of biologically active compounds.