Enolate Anions. II. Substituent Effects of Sodium Ethyl Phenylacetates in DMSO
作者:Syun-ichi Kiyooka、Yoshinobu Ueda、Kojiro Suzuki
DOI:10.1246/bcsj.53.1656
日期:1980.6
The UV-visible, IR, and 1H-NMR spectra of the sodium enolates of ethyl phenylacetates (substituents; p-CH3O, p-CH3, m-CH3, H, p-Cl, p-CH3CO, m-CH3CO, p-COOC2H5, p-CN, and p-NO2) in DMSO were measured at room temperature. The derivatives with electron-attracting groups at the para position exhibit their absorption maxima with e>104 in visible regions above 400 nm. The visible spectra suggest the presence
苯乙酸乙酯(取代基;p-CH3O、p-CH3、m-CH3、H、p-Cl、p-CH3CO、m-CH3CO、p-在室温下测量 DMSO 中的 COOC2H5、p-CN 和 p-NO2)。在对位具有吸电子基团的衍生物在 400 nm 以上的可见光区域显示出其吸收最大值,e>104。可见光谱表明它们在对位的吸电子基团和通过苯环的烯醇阴离子部分之间存在共振。红外光谱中烯醇化物的羰基伸缩振动和 1H-NMR 光谱中烯醇化物的残留次甲基质子的化学位移可以通过使用取代基常数 σ 和 σ- 很好地解释。meta 线和 para 线的 ρ 值差别很大。