Slow Tautomerization in a Rhenium-Oxo-Hydroxide Complex


  • Low-Valent Metal-Oxo Compounds, Part 6. This work was supported by Research Corporation, Chevron Research Co., The National Science Foundation, and the Petroleum Research Fund. Part 5: [4].


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The considerable changes in structure and bonding which accompany proton transfer between the two oxygen atoms in 1 cause the tautomerism 11′ to be a slow process: the approach to equilibrium is first order and has a half-life of 11 h! The most important reason for the high activation barrier for the tautomeric equilibrium is the necessary rearrangement of the acetylene ligands.