Volume 133, Issue 12 pp. 6442-6446
Zuschrift

Reactivity and Selectivity in Ruthenium Sulfur-Chelated Diiodo Catalysts

Noy B. Nechmad

Noy B. Nechmad

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

These authors contributed equally to this work.

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Victoria Kobernik

Victoria Kobernik

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

These authors contributed equally to this work.

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Naziha Tarannam

Naziha Tarannam

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

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Ravindra Phatake

Ravindra Phatake

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

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Or Eivgi

Or Eivgi

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

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Sebastian Kozuch

Sebastian Kozuch

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

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N. Gabriel Lemcoff

Corresponding Author

N. Gabriel Lemcoff

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

Ilse Katz Institute for Nanotechnology Science, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

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First published: 12 February 2021
Citations: 2

Abstract

A trifluoromethyl sulfur-chelated ruthenium benzylidene, Ru-S-CF3-I, was synthesized and characterized. This latent precatalyst provides a distinct activity and selectivity profiles for olefin metathesis reactions depending on the substrate. For example, 1,3-divinyl-hexahydropentalene derivatives were efficiently obtained by ring-opening metathesis (ROM) of dicyclopentadiene (DCPD). Ru-S-CF3-I also presented a much more effective photoisomerization process from the inactive cis-diiodo to the active trans-diiodo configuration after exposure to 510 nm (green light), allowing for a wide scope of photoinduced olefin metathesis reactions. DFT calculations suggest a faster formation and enhanced stability of the active trans-diiodo species of Ru-S-CF3-I compared with Ru-S-Ph-I, explaining its higher reactivity. In addition, the photochemical release of chloride anions by irradiation of Cl-BODIPY in the presence of DCPD derivatives with diiodo Ru benzylidenes, led to in situ generation of chloride complexes, which quickly produced the corresponding cross-linked polymers. Thus, novel selective pathways that use visible light to guide olefin metathesis based synthetic sequences is presented.

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