Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 2, Pages 764-767Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201508966
Keywords
metathesis; N-heterocyclic carbenes; photochemistry; polymerization; ruthenium
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Funding
- Israel Science Foundation
- Magnet Program of the Office of the Chief Scientist of the Ministry of Industry, Trade Laboris
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A sulfur-chelated photolatent ruthenium olefin metathesis catalyst has been equipped with supersilyl protecting groups on the N-heterocyclic carbene ligand. The silyl groups function as an irreversible chromatic kill switch, thus decomposing the catalyst when it is irradiated with 254 nm UV light. Therefore, different types of olefin metathesis reactions may be started by irradiation with 350 nm UV light and prevented by irradiation with shorter wavelengths. The possibility to induce and impede catalysis just by using light of different frequencies opens the pathway for stereolithographic applications and novel light-guided chemical sequences.
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