The λmax values in the ultraviolet spectra of 61 pairs of 2,4-dinitrophenylhydrazones (DNP) and O-(2,4-dinitrophenyl)oximes (DNO) were compared. The λmax(DNP)–λmax(DNO)=Δλ values are 61 ± 1 mµ for aliphatic carbonyl compounds, 69 ± 1 mµ for aromatic aldehydes and ketones, and 71 ± 1 mµ for diaryl ketones. Deviations were found for several ortho substituents or for para substituents having strong +M
比较了61对
2,4-
二硝基苯基hydr(DNP)和O-(
2,4-
二硝基苯基)
肟(DNO)在紫外光谱中的λmax值。的λ最大(DNP)-λ最大值(DNO)=Δλ的值是61±1米μ为脂族羰基化合物,69±1米μ为芳香醛和
酮,和71±1米μ为二芳基
酮。被发现的数偏差邻取代基或对位具有强+取代基中号效果。讨论了确定恒定性和Δλ值偏差的因素。