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decomposition of oxo complex 2, and k1(obs) represents the pseudo-first-order rate constants for the decay
of oxo complex 2 in the presence of sulfides. The second-order rate constants, k2, were obtained by the
relation k2 ¼ k1/[sulfide].
Stoichiometry and Product Analysis. The reaction studied under the experimental conditions ([2a] ¼
0.0026m; [PhSPh] ¼ 0.20m) gave the sulfoxide PhSOPh in ca. 68% yield, and the [MgIII(salen)] complex
in ca. 95% yield, with a negligible amount of sulfone. Accordingly, the stoichiometry of the reaction can
be represented by Scheme 4.
Scheme 4
The reaction mixture from an actual kinetic run was concentrated to remove the solvent, the residue
then extracted with CHCl3, and the extract dried (Na2SO4) and concentrated. GC Analysis of the residue
(GC17A-Schimadzu gas chromatograph) indicated the formation of sulfoxide as the only product under
the present experimental conditions. The yield of sulfoxide (65 – 75%) depended on the sulfide and
oxomanganese(V) complex employed.
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