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Chromium catalysts, Nozaki-Hiyama-Kishi

The multi-component procedure is also effective for the chromium-catalyzed addition of organic halides to aldehydes (the Nozaki-Hiyama-Kishi reaction) [73]. The active Cr(II) species is recycled by redox interaction with Mn powder as the stoichiometric co-reductant in the presence of MesSiCl (Scheme 34), which mainly liberates the chromium catalyst from the alkoxide adduct. The chemo- and diastereo-selective addition reaction is performed with a variety of organic halides and alkenyl triflates. In the case of crotyl bromide, the addition is highly stereoconvergent, i.e., the respective anti-... [Pg.81]

The specific roles of each metal of nickel/chromium catalysts of Nozaki-Hiyama-Kishi coupling of vinyl halides and aldehydes have been studied by UV-visible spectroscopy, electrochemistry, and spectroelectrochemical methods. Chromium(II) chloride does not react with the vinyl halide but converts nickel(II) to nickel(I) species, which does. The unstable nickel-vinyl species can be stabilized in turn by the chromium. ... [Pg.28]

See other pages where Chromium catalysts, Nozaki-Hiyama-Kishi is mentioned: [Pg.233]    [Pg.269]    [Pg.270]    [Pg.364]    [Pg.447]    [Pg.155]    [Pg.163]   


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Catalyst chromium

Chromium catalysts, Nozaki-Hiyama-Kishi reaction

Hiyama

Kishi

Nozaki

Nozaki-Hiyama-Kishi

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