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The direct strong steric interaction between substrate substituents and ligand substituents was first discovered in asymmetric addition of diethylzinc to aldehydes catalyzed by sterically congested ferrocenyl aziridino alcohol derivatives. In addition, this nonbonded steric repulsion influenced significantly enantioselectivities of this reaction, and even led to inversion of the absolute configuration...
Free and immobilized baker’s yeast were successfully employed in the asymmetric hydrogenations of prochiral β-keto esters and ketones in glycerol. The activities with immobilized cells were always higher then with free cells while the enantioselectivity was very high (99%) with both catalysts. Using glycerol, a non-toxic, biodegradable and recyclable liquid, as an environmentally friendly solvent...
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