Synthesis and Studies of Some Ketosulfones, Part II

Bromoketosulfones have been prepared. Their chemical composition and structure are proved by spectral methods. The addition of unsubstituted and substituted sulfinic acid to 2-bromo-1,3-diphenyl-2-propenone and 3-bromo-4-phenyl-3-butene-2-on has been studied kinetically by means of UV spectroscopy. Reactions follow the second-order kinetics V = R [bromochalkone][sulfinic acid]. The dependence of rate constants on the temperature and the influence of p-substitutents on the kinetic parameters have been investigated. The activation energy and the enthalpy of activation are calculated in the temperature range 288–308 K.

Keywords:

• Bromochalkones
• nucleophilic addition
• sulfinic acids