摘要 : The relative stereochemistry of 2,3-dialkylpentenoic acids and derivatives thereof can be easily determined by comparison of ~(13)C NMR spectra of the syn and anti isomers.The chemical shifts of several of the resonances of the an... 展开 The relative stereochemistry of 2,3-dialkylpentenoic acids and derivatives thereof can be easily determined by comparison of ~(13)C NMR spectra of the syn and anti isomers.The chemical shifts of several of the resonances of the anti isomer lie downfield relative to the syn isomer. 收起