Z-selective olefin metathesis grubbs, catalyst information
This marks the first report of such C-H activated chelates providing metathesis active complexes. Notably, these results compare favorably to those previously reported from the research groups of Professors Schrock and Hoveyda.
However, it is noted that strict exclusion of oxygen is required. These species displayed greater cis-selectivity in a standard cross-metathesis assay1 compared to the traditional 2nd generation catalysts; however, they still provided the trans isomer as the major product. Generally, this type of NHC ligand derived C-H activation occurs from coordinatively unsaturated species during a metathesis reaction, leading to catalyst decomposition.
Also noteworthy is the fact that the best experimental conditions involve performing the reaction in a 1: Novel catalyst developments will ultimately provide new opportunities and applications for this versatile technology. H2O, thus, dry solvents are not a requirement. Now, Koji Endo and Bob Grubbs have described the first report of a Ru-based catalyst that religon essays the formation of cis olefins, employing a novel chelated NHC catalyst architecture in conjunction with a pivalate ligand.
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