Invited
This talk will be mostly about our work on changing the coordinating sphere of ruthenium benzylidenes to achieve new catalytic properties

One of the most striking success stories in recent times in the area of catalysis has been in the development of the olefin metathesis reaction. Even after the award of the 2005 Nobel Prize to Chauvin, Schrock and Grubbs, the olefin metathesis method has continued to evolve, producing more efficient catalysts, new methodologies and enhanced selectivity. Our group has also contributed to this area in the past decade, especially using Ruthenium benzylidenes, and we will show how the judicious choice of the correct ligand sphere can be used to perform novel olefin metathesis sequences. While some past examples will be shown, most of the talk will be dedicated to recent efforts and unpublished material, including selective light activation with sulfur and phosphorous containing ligands, the use of Bertrand`s cyclic alkylamino carbenes (CAAC) and the impact of the anionic ligands on reactivity.

References:

Rozenberg, I., Eivgi, O., Frenklah, A., Kozuch, S., Butilkov, D., Kozuch, S. and Lemcoff, N.G., Synthesis and Catalytic Properties of Sulfur-Chelated Ruthenium Benzylidenes Bearing a CAAC Ligand, ACS catalysis , 2018, DOI: 10.1021/acscatal.8b0212

Eivgi, O., Guidone, S., Frenklah, A., Kozuch, S., Goldberg, I. and Lemcoff, N.G., Photoactivation of Ruthenium Phosphite Complexes for Olefin Metathesis, ACS catalysis , 2018, 8, 6413-6418, DOI:10.1021/acscatal.8b01637

Ivry, E., Frenklah, A., Ginzburg, Y., Levin, E., Goldberg, I., Kozuch, S., Lemcoff, N.G. and Tzur, E., Light- and Thermal-Activated Olefin Metathesis of Hindered Substrates, Organometallics, 2018, 37, 176-181

Sutar, R.L., Eivgi, O., Sen, S., Segalovich, G., Schapiro, I., Reany O. and Lemcoff, N.G., Guiding a Divergent Reaction by Photochemical Control: Bichromatic Selective Access to Levulinates and Butenolides, Chemical Science, 2018, 9, 1368-1374

Butilkov, D., Frenklah, A., Rozenberg, I., Kozuch, S. and Lemcoff, N.G., Highly Selective Olefin Metathesis with CAAC-Containing Ruthenium Benzylidenes, ACS Catalysis, 2017, 7, 7634 - 7637

Eivgi, O., Sutar, R., Reany, O. and Lemcoff, N.G., Bichromatic Photosynthesis of Coumarins by UV Filter Enabled Olefin Metathesis, Advanced Synthesis & Catalysis, 2017, 359, 2352 - 2357

and others...