作者:N. S. Nudelman、S. B. Cerdeira
DOI:10.1002/mrc.1260240607
日期:1986.6
observable with 2‐N‐butylamine‐, 2‐N‐cyclohexylamine‐ and 2‐(N‐piperidyl)‐substituted nitropyridines, whose 1H and 13C NMR spectra were also determined. In the case of the secondary amines, a hydrogen bond between the amino proton and the 3‐nitro group was clearly detected. 1H and 13C NMR spectra of 2,6‐dinitro‐, 2,4‐dinitro‐ and 2,4,6‐trinitro‐2‐R‐benzenes (R = OCH3, NHC4H9, NH‐cyclo‐C6H11, NC5H10) were
已经测定了 3-硝基-、5-硝基-和 3,5-二硝基-2-甲氧基吡啶的 1H 和 13C NMR 谱。结果显示了 2-甲氧基优选的顺式构象,以及该基团的氧原子与阻碍 3-硝基取代衍生物共轭的邻硝基氧原子之间空间排斥的重要性。用 2-N-丁胺-、2-N-环己胺-和 2-(N-哌啶基)-取代的硝基吡啶也可以观察到类似的共振空间抑制,其 1H 和 13C NMR 光谱也被测定。在仲胺的情况下,可以清楚地检测到氨基质子和 3-硝基之间的氢键。2,6-二硝基-、2,4-二硝基-和2,4,6-三硝基-2-R-苯(R = OCH3、NHC4H9、NH-环-C6H11、NC5H10) 也被记录并与吡啶衍生物的那些进行比较。如果硝基的共轭不受阻碍,则电子氮杂和硝基效应是可比的。