. In contrast to that of the precursor compound 1 (Mo-O-t 1.700(4) Angstrom), the terminal Mo-O-t distance in 3 (1.668(2) Angstrom) is typical of Mo-O bonds of order 3, which drives the formation of an apparently unstable three-membered metallacycle via spectator oxo stabilization (Rappe, A. K.; Goddard, W. A., III. J. Am. Chem, Sec. 1982, 104, 448). With thioglycolic acid, 1 undergoes an oxo-transfer reaction through a coupled electron-proton transfer mechanism involving two steps, each having first-order dependence on H(2)tga concentration. The system offers an interesting reactivity model for the ore-transfer pathway of oxidoreductase Mo enzymes.
. In contrast to that of the precursor compound 1 (Mo-O-t 1.700(4) Angstrom), the terminal Mo-O-t distance in 3 (1.668(2) Angstrom) is typical of Mo-O bonds of order 3, which drives the formation of an apparently unstable three-membered metallacycle via spectator oxo stabilization (Rappe, A. K.; Goddard, W. A., III. J. Am. Chem, Sec. 1982, 104, 448). With thioglycolic acid, 1 undergoes an oxo-transfer reaction through a coupled electron-proton transfer mechanism involving two steps, each having first-order dependence on H(2)tga concentration. The system offers an interesting reactivity model for the ore-transfer pathway of oxidoreductase Mo enzymes.