Abstract
A mechanistic study of the reductive dechlorination of carbon tetrachloride by vitamin B 12 (cyanocobalamin) in the presence of dithiothreitol was conducted as a function of redor potential and pH. The solution redor potential decreased both with an increase in the total concentration of dithiothreitol present and with an increase in pH. The pseudo-first-order rate constant of carbon tetrachloride disappearance increased with decreasing redor potential. The predominant cobalt species present under the reaction conditions was cobalamin(II) (vitamin B 12r ), as confirmed by spectrophotometric analysis, suggesting a one-electron reduction of vitamin B 12 and the involvement of two vitamin B 12 molecules per reacting carbon tetrachloride molecule
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