Stereodivergent Quaternization of 2-Alkyl-2-p-tolylsulfinylacetonitriles: NMR Spectroscopic Evidence of Planar and Pyramidal Benzylic Carbanions
作者:José Luis García Ruano、Ana M. Martín-Castro、Francisco Tato、Esther Torrente、Ana M. Poveda
DOI:10.1002/chem.200903521
日期:——
isomers. The dependence of the stereochemicalcourse of the reactions on the experimental conditions (mainly on the counterion) has been rationalized by assuming a planar or pyramidal structure for the benzylic carbanions. This hypothesis has been supported by NMR spectroscopic studies, which permit one to assign a chelated pyramidal structure to the sodium benzylic carbanions and an almost planar