15969-58-1Relevant articles and documents
Molybdenum and copper catalysis of reductions by titanium(II) and titanium(III)
Yang, Zhiyong,Gould, Edwin S.
, p. 396 - 398 (2007/10/03)
Reductions of vanadium(iv), benzoquinone, and tri-iodide, both by titanium(iii) and by titanium(ii), are catalyzed by molybdenum(vi). The VO 2+-Ti(ii) reaction is catalyzed by copper(ii) as well. Reactions of Ti(ii) with the oxidant in excess y
Reactions of tris(oxalato)cobaltate(in) with two-electron reductants
Yang, Zhiyong,Gould, Edwin S.
, p. 3601 - 3603 (2007/10/03)
The tris(oxalato)cobaltate(in) complex [Co(C2O4) 3]3-, EoCoIII/II = +0.57 V) is readily reduced by the 2e- reagents, Sn(II) and Ge(ii), in contrast to (NH3)5CoCl2+ and (NH3) 5CoBr2+, which are unreactive toward these donors. Rates for the oxalato oxidant are only 10-3-10-2 as great as those for vitamin B12a (aquacob(III)alamin, Eo +0.35 V at pH 1), in accord with the suggestion that reductions of corrin-bound cobalt(III) by Sn(II) and Ge(II) occur predominantly through an additional path involving Co(I). Reductions of the oxalato complex by 2e- donors are taken to proceed by initial formation of odd-electron intermediates (e.g., Sn III and GeIII) which react rapidly with CoIII. Such a two-step sequence is in keeping with the observed behavior of the rare reductant, TiII, which is found to be oxidized by [Co(C 2O4)3]3- more slowly than (independently prepared) Ti(III) under comparable conditions.
