Bulky N‑Phosphino-Functionalized N‑Heterocyclic Carbene Ligands: Synthesis, Ruthenium Coordination Chemistry, and Ruthenium Alkylidene Complexes for Olefin Metathesis

Bulky N‑Phosphino-Functionalized N‑Heterocyclic Carbene Ligands: Synthesis, Ruthenium Coordination Chemistry, and Ruthenium Alkylidene Complexes for Olefin Metathesis

Bing Wu, Kathryn M. Gramigna, Mark W. Bezpalko, Bruce M. Foxman, and Christine M. Thomas*

Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States

Inorganic Chemistry; http://pubs.acs.org/doi/pdf/10.1021/acs.inorgchem.5b00513

Abstract:
Ruthenium chemistry and applications in catalytic olefin metathesis based on N-phosphino-functionalized N-heterocyclic carbene ligands (NHCPs) are presented. Alkyl NHCP Ru coordination chemistry is described, and access to several potential synthetic precursors for ruthenium alkylidene complexes is outlined, incorporating both trimethylsilyl and phenyl alkylidenes. The Ru alkylidene complexes are evaluated as potential olefin metathesis catalysts and were shown to behave in a latent fashion. They displayed catalytic activity at elevated temperatures for both ring closing metathesis and ring opening metathesis polymerization.

TOC: