Synthesis and Activity of a New Generation of Ruthenium-Based Olefin Metathesis Catalysts Coordinated with 1,3-Dimesityl-4,5-dihydroimidazol-2-ylidene Ligands§

Matthias Scholl, Sheng Ding, Choon Woo Lee, and Robert H. Grubbs*
The Arnold and Mabel Beckman Laboratory of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125
Org. Lett., 1999, 1 (6), pp 953–956
DOI: 10.1021/ol990909q
Publication Date (Web): August 13, 1999
Copyright © 1999 American Chemical Society
§

 Dedicated to Prof. Gregory C. Fu on the occasion of his 36th birthday.

,
*

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

, rhg@its.caltech.edu

Abstract

Abstract Image

A new family of 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene-substituted ruthenium-based complexes 9a−c has been prepared starting from RuCl2(CHPh)(PCy3)2 2. These air- and water-tolerant complexes were shown to exhibit an increased ring-closing metathesis activity at elevated temperature when compared to that of the parent complex 2 and the previously developed complex 3. In many instances the activity of these complexes also rivaled or exceeded that of the alkoxy−imido molybdenum complex 1. Catalyst loadings of as low as 0.05 mol % could be used.

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History

  • Published In Issue September 23, 1999
  • Received August 4, 1999

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