Reactions between Mo(NAr)(CHR)(MePyr)-(OTPP) (Ar = 2,6--PrCH, R = H or CHCMePh, MePyr = 2,5-dimethylpyrrolide, OTPP = O-2,3,5,6-PhCH) and CH=CHX where X = B(pin), SiMe, -carbazolyl, -pyrrolidinonyl, PPh, OPr, or SPh lead to Mo(NAr)(CHX)-(MePyr)(OTPP) complexes in good yield. All have been characterized through X-ray studies (as an acetonitrile adduct in the case of X = PPh). The efficiencies of metathesis reactions initiated by Mo(NAr)(CHX)(MePyr)(OTPP) complexes can be rationalized on the basis of steric factors; electronic differences imposed as a consequence of X being bound to the alkylidene carbon do not seem to play a major role. Side reactions that promote catalyst decomposition do not appear to be a serious limitation for Mo=CHX species.
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| http://dx.doi.org/10.1021/om400584f | DOI Listing |
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