Abstract
The enantiomeres of the title compounds1–8 could be separated by enantioselective chromatography on microcrystalline triacetylcellulose in ethanol. A high stereoselectivity of the Michael addition of dimethylmalonate was observed only for theortho-substituted complexes1,2 and3, while the selectivity decreased withmeta-substituted substrates. A synthesis of 3-(ortho-dimethylaminophenyl)-tricarbonylchromium-1-phenyl-2-propenone (4) and 3-(meta-dimethylaminophenyl)-tricarbonylchromium-1-phenyl-2-propenone (8) is described. Methods for the estimation of diastereomeric excess (d.e.) and — after decomplexation — enantiomeric excess (e.e.) are compared. The absolute chiralities of complexes were determined by optical comparison and by chemical correlation.
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