title: Z-Selective Ruthenium Metathesis Catalysts: Comparison of Nitrate and Nitrite X-type Ligands.
abstract: Two new Ru-based metathesis catalysts,3and4, have been synthesized for the purpose of comparing their catalytic properties to those of theircis-selective nitrate analogues,1and2. Although catalysts3and4exhibited slower initiation rates than1and2, they maintained highcis-selectivity in homodimerization and ring-opening metathesis polymerization reactions. Furthermore, the nitrite catalysts displayed highercis-selectivity than2for ring-opening metathesis polymerizations, and4delivered higher yields of polymer.
authors.affiliation: Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125.
authors.forename: Melanie A
authors.initials: MA
authors.lastname: Pribisko
authors.affiliation: Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125.
authors.forename: Tonia S
authors.initials: TS
authors.lastname: Ahmed
authors.affiliation: Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125.
authors.forename: Robert H
authors.initials: RH
authors.lastname: Grubbs