Kinetic and equilibrium studies of the reactions of 4-nitrobenzofurazan and some derivatives with sulfite ions in water. Evidence for the Boulton–Katritzky rearrangement in a σ-adductElectronic supplementary information (ESI) available: Tables S1–S4. See http://www.rsc.org/suppdata/p2/b1/b108591n/
作者:Michael R. Crampton、Lyndsey M. Pearce、Lynsey C. Rabbitt
DOI:10.1039/b108591n
日期:2002.1.23
The reactions with sulfite ions in water of 4-nitrobenzofurazan, 1, 4-nitrobenzofuroxan, 2, and three 4-nitro-7-substituted benzofurazans have been examined by 1H NMR spectroscopy and stopped-flow spectrophotometry. For each substrate the initial reaction occurs at the 5-position to give σ-adducts which have considerably higher thermodynamic stability than the corresponding adduct of 1,3,5-trinitrobenzene
与的反应 亚硫酸盐 离子在 水 的 4-硝基苯并呋喃,1,4-硝基苯并呋喃,2和3个4-硝基-7取代的苯并呋喃酮已通过1 H NMR光谱 和停止流 分光光度法。对于每种底物,初始反应均在5位发生,从而得到σ加合物,其热力学稳定性比相应的ε加合物高。1,3,5-三硝基苯。在1和2的情况下,5加合物的异构化反应缓慢发生,从而生成在7位带有亚硫酸盐的加合物。用15 N标记的2的1 H NMR测量提供了证据,表明此处的重排涉及分子内Boulton-Katritzky机制。