Latent sulfur chelated ruthenium catalysts: Steric acceleration effects on olefin metathesis |
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Authors: | Tamar Kost Israel Goldberg N Gabriel Lemcoff |
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Institution: | a Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel b School of Chemistry, Tel-Aviv University, Tel-Aviv 69978, Israel c Achva Academic College, Shikmim 79800, Israel |
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Abstract: | A series of sulfur chelated dormant ruthenium olefin metathesis catalysts is presented. The catalysts prepared were shown to possess the uncommon cis-dichloro arrangement and were mostly inactive at room temperature. By systematically modifying the size of the substituent groups at the chelating sulfur atom, catalyst activity at different temperatures was significantly affected; more bulky substituents fomented activity at lower temperatures. The catalysts were also shown to be stable in solution and retained their catalytic activity even after being exposed to air for two weeks. |
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Keywords: | Ruthenium Ring closing metathesis Latent catalysts Sulfur chelation |
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