期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 48, 页码 15527-15530出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b08792
关键词
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资金
- [NSFCHE-1339674]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1339674] Funding Source: National Science Foundation
The ability to exert spatial and temporal control over a transition-metal catalyst offers diverse opportunities for the fabrication of functional materials. Using an external stimulus such as visible light to toggle a catalyst between an active and dormant state has proven to be an effective approach for controlled, radical methodologies. Outside of radical bond formation, there is a dearth of evidence that suggests traditional transition metal catalysis can similarly be controlled with visible light energy. Many cobalt complexes that catalyze the [2+2+2] cycloaddition are assisted by UV photolysis, but strict photocontrolled methods are unattainable due to high levels of thermally driven reactivity. Herein, we disclose the first light-controlled, cobalt-catalyzed [2+2+2] cycloaddition via a dual cobalt and photoredox catalyst manifold. We demonstrate the power of this method with a spatially and temporally resolved technique for arene formation using photolithography.
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