期刊
CHEMICAL COMMUNICATIONS
卷 54, 期 66, 页码 9139-9142出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cc05172k
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Bis(oxazolinyldimethylmethyl)pyrrol (PdmBox) stereodirecting ligands provided the key to the chromium(ii)-catalysed highly enantioselective hydrosilylation of ketones. A rare square planar, chiral chromium(ii) alkyl complex was found to serve as a potent precatalyst for the reduction of a broad range of aryl alkyl and dialkyl ketone derivatives. The stereoelectronic preference of the open d(4) shell of chromium(ii) firmly locks the molecular catalyst in a square planar geometry giving rise to two blocked quadrants of the coordination sphere. This earth-abundant base metal catalytic platform produces the corresponding chiral alcohols in excellent isolated yields with up to 98 %ee under mild reaction conditions (-40 degrees C to rt) and at low catalyst loadings (as low as 0.5 mol%).
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