1-ethyl-2,3,3-trimethyl-3H-indol-1-ium-5-sulfonate; CAS No.: 146368-07-2; 1-ethyl-2,3,3-trimethyl-3H-indol-1-ium-5-sulfonate. PROPERTIES: 1-ethyl-2,3,3-trimethyl-3H-indol-1-ium-5-sulfonate is a crystalline solid. Its molecular formula is C12H15N2O3S, and the molecular weight is approximately 281.32 g/mol. The compound has a melting point of approximately 150-152 C. It is moderately soluble in water and commonly used in the form of its sulfonate salt. For proper storage, it should be kept in a sealed container at room temperature, away from heat and direct sunlight. As a compound containing an indole ring, an ethyl group, three methyl groups, and a sulfonate group, it may exhibit certain reactivity and stability. When handling it, protective gloves and eye protection should be worn. In case of accidental contact with skin or eyes, immediate rinsing with water is necessary. APPLICATIONS: In organic synthesis, 1-ethyl-2,3,3-trimethyl-3H-indol-1-ium-5-sulfonate serves as a valuable intermediate. The sulfonate group can undergo various reactions such as hydrolysis and alkylation. The indole ring provides opportunities for further functionalization. In the pharmaceutical industry, derivatives of this compound can be explored as potential drug candidates. For example, in the development of certain anti-inflammatory drugs, the structure of 1-ethyl-2,3,3-trimethyl-3H-indol-1-ium-5-sulfonate can be modified to enhance the drug's efficacy and reduce side effects (as reported in medicinal chemistry journals). Additionally, in the field of chemical research, it can be used as a starting material for the synthesis of novel organic compounds with potential applications in catalysis and sensing (as mentioned in organic chemistry research papers).