Kinetic Studies on the reaction of Sulfinic Acids with Conjugated Alkenes: II. Kinetics of the Addition of Arenesulfinic Acids to 4-Substituted 2-Nitroethenylarenes

Abstract

The kinetics of the addition of arenesulfinic acids to 4-substituted 2-nitroethenylarenes was studied by means of UV spectrophotometry. The effect of 4-substituting groups in benzenesulfinic acids, and the change in reactivity of nitroethylene system due to typical electron-donating and electron-withdrawing groups were investigated. The substituent effect on benzenesulfinic acid fits Hammett's equation, p-value at 298 K being - 1.12 (r = 0.987). Kinetic studies were carried out at 288-308 K, and the activating energy and the enthalpy of activation were determined.

Key Words:

• Sulfinic acid
• 1-nitro-4-(2-nitroethenyl)benzene
• 1-methoxy-4-(2-nitroethenyl)benzene
• rate constants
• activating energy
• enthalpy of activation