Acidity and basicity of primaryN-phenylnitramines: catalytic effect of protons on the nitramine rearrangement
作者:Zdzis?aw Daszkiewicz、Grzegorz Spaleniak、Janusz B. Kyzio?
DOI:10.1002/poc.461
日期:2002.2
strongly (ρ = 4) influence the rate of nitramine rearrangement. The acidities of primary N-phenylnitramines (3.77 < pKA < 5.62) are similar to those of benzoic acids and weakly dependent (ρ = 1) on the electronic character of a substituent. Based on the analogy with benzoic acids, it has been calculated that basicities of nitramines (pKB ≈ 21) are extremely low. Consequently, addition of protons to an intact
对重取代的N-苯基硝胺可以通过重氮盐的氧化或在碱性或酸性条件下的硝化反应来制备。同位素[ 15 N-NO 2 ]标记表明,N-硝基基团的能带出现在1318–1323和1585–1607 cm -1地区。在氮NMR光谱中,硝基氨基基团在-193±3(NH)和-32±3 ppm(NO 2)。基于增量和可加性规则,质子和碳NMR光谱中的化学位移是可预测的。光谱数据表明,在硝基氨基和与该环结合的另一个取代基之间没有共轭。这似乎与众所周知的事实相反,即取代基强烈(ρ= 4)影响硝胺重排的速率。伯N-苯基硝胺的酸度(3.77