Nitrosation by alkyl nitrites. Part 6. Thiolate nitrosation
作者:Hanif M. S. Patel、D. Lyn H. Williams
DOI:10.1039/p29900000037
日期:——
differs significantly from the literature value. With simple alkylnitrites (ethyl, isopentyl, isopropyl and t-butyl) steric effects appear to be the major influences in reactivity, whereas electron-withdrawing substituents in the 2-position greatly increase the rate constants. The reactions of 2,2,2-trichloroethyl nitrite were too fast to measure at all pH values, whereas the reaction of 2,2-dichloroethyl
以下每种硫醇在25°C的水中在6-13的pH范围内与一定范围内的亚硝酸烷基酯反应,在溶液中生成相应的亚硝酸盐:L-半胱氨酸,N-乙酰基-L-半胱氨酸,L-半胱氨酸甲酯,L-半胱氨酸乙酯,谷胱甘肽和巯基乙酸。速率常数的pH依赖性清楚地表明,反应仅通过硫醇根阴离子RS –发生。对于Ñ乙酰基大号-半胱氨酸和巯基乙酸只有一个RS -物种是可能的和定量动力学分析产率p ķ一个RSH电离的值与文献值非常吻合。对于每种剩余的硫醇,可能有两个硫醇根离子(NH 2 RS –和NH 3 RS –),所有亚硝酸烷基酯的测得的速率常数通常跟随从公开的显微图中获得的总硫醇根离子浓度(作为pH的函数)。 p K a值。通过计算机将动力学结果拟合到浓度曲线的另一种方法是产生通常与文献值相吻合的微观p K a值。L-半胱氨酸是一个例外,其中测得的(p K a)D值(对于NH 2 -RSH→NH 2 RS –)与文献值明显
Cyclodextrins as Enzyme Models in Nitrosation and in Acid−Base-Catalyzed Reactions of Alkyl Nitrites
作者:Emilia Iglesias
DOI:10.1021/ja9827696
日期:1998.12.1
reactions of esters but not those of alkyl nitrites, together with the marked differences between the chemistry of esters and alkyl nitrites, prompted us to investigate the influence of β-cyclodextrin (β-CD) on the reactions of alkyl nitrites. Due to the particular characteristics of alkyl nitrite reactions, the system β-cyclodextrin−alkyl nitrites allows us to explore cyclodextrin's behavior under
The Reaction of ω-Ethoxyalkyl Bromides with Silver(I) Cyanide and Nitrite. The Participation of an Oxonium Ion
作者:Nanao Watanabe、Sakae Uemura、Masaya Okano
DOI:10.1246/bcsj.52.1975
日期:1979.7
The reaction of ω-ethoxyalkyl bromides (Cn: n=2–5) with silver(I) cyanide or nitrite in less polar solvents to give the corresponding isocyanide or a mixture of the corresponding alkyl nitrite and nitroalkane respectively, proceeded with ease only when n=4. In the latter reaction, the ratios of O- and N-attack (O/N) were 16–18/ 82–84 and 31–46/54–69 when n\eweq4 and n=4 respectively. The facile reaction
HOO– is nitrosated efficiently and directly by alkyl nitrites in basic media to yield quantitative amounts of peroxynitrite.
HOO– 在碱性介质中被亚硝酸烷基酯有效直接亚硝化,产生定量的过氧亚硝酸盐。
Pseudophase Approach to Reactivity in Microemulsions: Quantitative Explanation of the Kinetics of the Nitrosation of Amines by Alkyl Nitrites in AOT/Isooctane/Water Microemulsions
作者:L. García-Río、J. R. Leis、J. C. Mejuto
DOI:10.1021/jp953264u
日期:1996.1.1
The kinetics of nitroso group transfer from 2-ethoxyethyl (EEN) and 2-bromoethyl (BEN) nitrite to the secondary amines piperazine (PIP), N-methylbenzylamine (NMBA), and morpholine (MOR) in bis(2-ethylhexyl) sulfosuccinate (AOT)/isooctane (iC(8))/water microemulsions were determined. They are explained quantitatively in terms of a model in which the reagents are distributed among the aqueous, organic, and AOT film surfactant, with the aqueous pseudophase and the surfactant film as the loci of the reaction.