Elimination and addition reactions. Part 30. Leaving group abilities in alkene-forming eliminations activated by sulphonyl groups
作者:Donald R. Marshall、Patsy J. Thomas、Charles J. M. Stirling
DOI:10.1039/p29770001898
日期:——
Rates of elimination of the group Z from a series of β-substituted sulphones, PhSO2·CH2·CH2Z, in ethanolic sodium ethoxide at 25 °C have been measured. For each substrate, the mechanism of the reaction has been shown to be the reversible carbanion mechanism [(E1cB)R] by determination of the primary kinetic deuterium isotope effect or by demonstration that deuterium-hydrogen exchange at Cβ is very much
在25°C的乙醇乙醇钠中,已测定了从一系列β-取代的砜PhSO 2 ·CH 2 ·CH 2 Z中消除Z基团的速率。对于每个基板,所述反应的机理已被证明是可逆碳负离子机构[(ë 1 CB)- [R ]通过测定的主动力学氘同位素效应或通过示范其中C氘-氢交换β是非常快比消除。