1H NMR kinetic investigation of the equilibrium between the Z- and E- isomers in a stable phosphorus ylide involving 2-mercaptobenzimidazole

A kinetic investigation of the interchange process in the equilibrium between the Z- and E- isomers of a stable phosphorus ylide involving 2-mercaptobenzimidazole has been undertaken by the 1H NMR technique. Kinetic and activation parameters such as k -1, k 1, k total, Ea 1, Ea -1, Ea total, δS# , δH# and δG# along with the thermodynamic parameters Ke , δH°, δG° and δS° were obtained from the experimental data for the forward and reverse reactions.