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Synthesis of optically active polymers with chiral units attached to rigid backbones and their application for asymmetric catalysis

โœ Scribed by Qiao-Sheng Hu; Chaode Sun; Colleen E Monaghan


Publisher
Elsevier Science
Year
2001
Tongue
French
Weight
70 KB
Volume
42
Category
Article
ISSN
0040-4039

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โœฆ Synopsis


Optically active ephedrine-bearing poly(phenylene)s have been synthesized by using the Suzuki coupling polymerization. Their application as polymeric chiral catalysts for asymmetric addition of diethylzinc to aldehydes has been studied and good enantioselectivity was observed. The strategy to synthesize these optically active polymers is potentially useful in the design and synthesis of other polymeric chiral catalysts for asymmetric catalysis.


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Synthesis of chiral phosphine ligands wi
โœ James M. Longmire; Xumu Zhang ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 204 KB

A general strategy for the synthesis of new chiral phosphine ligands has been discovered. A common feature of these ligands is that they contain rigid aromatic backbones which can be used to restrict conformational flexibility. The bite angle of P-M-P can be changed systematically depending on the