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- W1994808524 abstract "The 2, 4-pentanediol (PD) -tethered reaction is a stereocontrolled reaction having versatile applicability. When reactant and reagent elements are connected through a PD tether prior to their reaction, stereochemical purity of the product is very high for nine different types of reactions so far studied. Selectivity of one of the reactions shows temperature independency in a wide range from -78 to 150°C, which indicates that the selectivity is governed by the entropy term. The strict stereocontrol at the high reaction temperature can be extended to vapor phase reaction performed above 250 °C. To understand how the two methyl groups on the PD tether stereocontrol the reaction, a new parameter, chiral perturbation factor, is introduced. By this analysis, it is disclosed that the methyl groups do not promote large activation enthalpy change for both diastereomeric processes. In contrast, change in the activation entropy is large and in opposite sing, which should be an origin of the strict stereocontrol by the PD tether." @default.
- W1994808524 created "2016-06-24" @default.
- W1994808524 creator A5063644416 @default.
- W1994808524 date "2004-03-16" @default.
- W1994808524 modified "2023-09-27" @default.
- W1994808524 title "Chiral Tethered Reaction and Entropy-Driven Asymmetric Synthesis" @default.
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- W1994808524 doi "https://doi.org/10.1002/chin.200411264" @default.
- W1994808524 hasPublicationYear "2004" @default.
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