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- W189322022 endingPage "544" @default.
- W189322022 startingPage "515" @default.
- W189322022 abstract "A degree of stereoselective control of the course of a reaction, which is absent or different from that prevalent when the reaction is conducted in the absence of quaternary ammonium salts, may be achieved under ‘standard’ phase-transfer catalysed reaction conditions. The reactions, which are influenced most by the phase-transfer catalyst, are those involving anionic intermediates whose preferred conformations or configurations can be controlled by the cationic species across the interface of the two-phase system. Stereochemical control of a reaction can also be achieved using non-chiral catalysts, when a chiral centre already exists in the reactant. Specific control of the stereochemistry of the chemical reaction is better achieved using chiral phase-transfer catalysts. These catalysts interact specifically with the substrate and sterically hinder the approach of nucleophile to one face of the reactive site. Experimental procedures are essentially the same as those employed in reactions using achiral catalysts where there is no stereochemical control." @default.
- W189322022 created "2016-06-24" @default.
- W189322022 creator A5065571692 @default.
- W189322022 date "2001-01-01" @default.
- W189322022 modified "2023-09-26" @default.
- W189322022 title "Stereoselective Control in Phase-transfer Catalysed Reactions" @default.
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