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Hydrogen atom abstraction by a chromium IV oxo complex derived from O2
Kun Qin1, Christopher D Incarvito, Arnold L Rheingold
1Department of Chemistry and Biochemistry, Center for Catalytic Science and Technology, University of Delaware, Newark, DE 19716, USA.
Journal of the American Chemical Society
|November 21, 2002
Summary
Chromium(III) hydroxide and chromium(IV) oxo complexes were synthesized. The chromium(IV) oxo complex can abstract hydrogen atoms to form the chromium(III) hydroxide complex, with both structures characterized.
Area of Science:
- Inorganic Chemistry
- Organometallic Chemistry
- Coordination Chemistry
Background:
- Chromium complexes with porphyrin-like ligands are valuable in catalysis.
- Understanding the reactivity of high-valent chromium species is crucial for developing new synthetic methodologies.
Purpose of the Study:
- To synthesize and characterize novel chromium(III) hydroxide and chromium(IV) oxo complexes.
- To investigate the interconversion between these chromium species and the reactivity of the chromium(IV) oxo complex.
Main Methods:
- Synthesis of chromium complexes via reaction with oxygen atom donors.
- Structural characterization using X-ray crystallography.
- Investigation of hydrogen atom abstraction reactions.
Main Results:
- The chromium(III) hydroxide complex [TptBu,MeCr(OH)(pz'H)]BARF (1) was synthesized.
- The chromium(IV) oxo complex [TptBu,MeCr(O)(pz'H)]BARF (2) was synthesized.
- Complex 2 demonstrated the ability to abstract hydrogen atoms from organic molecules, yielding complex 1.
Conclusions:
- A new route to chromium(III) hydroxide complexes has been established.
- The chromium(IV) oxo complex exhibits reactivity consistent with hydrogen atom abstraction.
- Both synthesized complexes were structurally elucidated, providing insights into their bonding and electronic properties.
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