Z-Selective ruthenium metathesis catalysts: Comparison of nitrate and nitrite X-type ligands

• Published in: Polyhedron Vol. 84; pp. 144 - 149
• Main Authors: Pribisko, Melanie A., Ahmed, Tonia S., Grubbs, Robert H.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 14.12.2014
• Subjects: Olefin metathesis; Ring-opening metathesis polymerization; Ruthenium; X-ligand; Ring-opening metathesis polymerization; X-ligand; Ruthenium; Olefin metathesis
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2014.06.055

Two new Ru-based metathesis catalysts, 3 and 4, have been synthesized for the purpose of comparing their catalytic properties to those of their cis-selective nitrate analogues, 1 and 2. Although catalysts 3 and 4 exhibited slower initiation rates than 1 and 2, they maintained high cis-selectivity in homodimerization and ring-opening metathesis polymerization reactions. Furthermore, the nitrite catalysts displayed higher cis-selectivity than 2 for ring-opening metathesis polymerizations, and 4 delivered higher yields of polymer. [Display omitted] Two new Ru-based metathesis catalysts, 3 and 4, have been synthesized for the purpose of comparing their catalytic properties to those of their cis-selective nitrate analogues, 1 and 2. Although catalysts 3 and 4 exhibited slower initiation rates than 1 and 2, they maintained high cis-selectivity in homodimerization and ring-opening metathesis polymerization reactions. Furthermore, the nitrite catalysts displayed higher cis-selectivity than 2 for ring-opening metathesis polymerizations, and 4 delivered higher yields of polymer.