Reactions of Carbonyl Group with Nitroso Compounds: Reaction of Formaldehyde with Substituted Nitrosobenzenes
作者:Stanko Ur?i?
DOI:10.1002/hlca.19930760107
日期:1993.2.10
includes: (a) the order of reactivity of substituted nitrosobenzenes, as demonstrated by the plot of log kobsvs. σ Hammett parameters with slope of −1.74; (b) the observation of a general-acid catalysis; (c) the observation of the inverse solvent deuteriumisotopeeffect of ca. 1.8 in the reaction; (d) the observation of kinetic primary deuteriumisotopeeffect of ca. 8 related to the ‘water’ reaction
甲醛与取代的亚硝基苯反应生成相应的N-苯基异羟肟酸。提出了在该反应中涉及三个连续步骤的机理。第一步是亚硝基对羰基的亲核攻击,导致不稳定的四面体两性离子中间体的形成。在此步骤之后,质子转移到两性离子中间体上,形成更稳定的亚硝基羰基阳离子中间体,在随后的步骤中,将其速率控制地从亚硝基羰基的C原子上消除质子,生成最终产物异羟肟酸。第一步和第二步似乎是可逆的。获得的实验证据是对所研究反应进行描述的基础,其中包括:(a对数亚硝基苯的反应顺序,由log k obs vs.绘制。σ哈米特参数与-1.74斜率; (b)观察到一般的酸催化作用;(c)观察到约15 ℃的逆氘同位素效应。在反应中1.8; (d)的动力学初级氘同位素效应观察约。8与甲醛与取代的亚硝基苯反应中的“水”反应有关;(e)在反应中观察到一般碱的催化作用;(f)的动力学初级氘同位素效应观察约。2.1用于乙酸根离子催化的反应。
Reaction of substituted nitrosobenzenes with formaldehyde
作者:Olga Kronja、Julija Matijević-Sosa、Stanko Uršić
DOI:10.1039/c39870000463
日期:——
Substituted nitrosobenzenes react with formaldehyde in an acid-catalysed reaction giving N-phenylhydroxamic acids.
取代的亚硝基苯与甲醛在酸催化的反应中反应,生成N-苯基异羟肟酸。
Formation of hydroxamic acids promoted by metal ions. interaction of aldehyde carbonyl group with C-nitroso group in the presence of ferric ions
Formation of N-phenyl substituted hydroxamic acids in the reaction of formaldehyde with substituted mtrosobenzene is strongly catalysed by Fe3+ ions, which stabilize the transition state for the rate-controlling proton transfer from the carbon of nitrosocarbinolic cation intermediate leading to the product, hydroxamic acid
Fe 3+离子强烈催化甲醛与取代的亚硝基苯反应中N-苯基取代的异羟肟酸的形成,从而稳定了用于控制速率的质子从亚硝基碳氢化合物阳离子中间体的碳转移到最终产物羟肟酸的过渡态。酸
Ayyangar, N. R.; Brahme, K. C.; Shingare, M. S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1989, vol. 28, # 1-11, p. 961 - 963
作者:Ayyangar, N. R.、Brahme, K. C.、Shingare, M. S.、Srinivasan, K. V.
DOI:——
日期:——
N-arylhydroxamic acids: reaction of nitroso aromatics with .alpha.-oxo acids