The electronicstructures of 1,1-disubstituted 2,4-dinitronaphthalene Meisenheimercomplexes were studied by UV-visible and infrared spectrometry and compared with the results calculated by a semiempirical SCF-MO-CI method. The electronic transitions in the complexes were assigned to those of π-π*. Calculated transition energies and intensities agree well with the observed values. The infrared spectra
The reaction of 1-ethoxy-2,4-dinitronaphthalene (1) with pyrrolidine or piperidine in dimethyl sulfoxide occured in two stages (Stages I and II). In the stage I, a σ-adduct forms at such a rate as is measured by a stopped-flow technique, and in the stage II it decays at a slower and spectrophotometrically measurable rate. The pyrrolidine system is more reactive than the piperidine system in the stages
1-乙氧基-2,4-二硝基萘 (1) 与吡咯烷或哌啶在二甲基亚砜中的反应分两个阶段进行(阶段 I 和 II)。在阶段 I 中,σ 加合物以通过停流技术测量的速率形成,而在阶段 II 中,它以较慢且可通过分光光度法测量的速率衰减。吡咯烷体系比阶段 I 和 II 中的哌啶体系更具反应性,而前者在阶段 II 中的反应性约为 比后者高11000倍。NMR证据发现这种巨大差异源于阶段II的过渡态结构。此外,确定了激活参数,这很好地对应于这种反应性差异。
Kinetics of reactions of cyclic secondary amines with 2,4-dinitro-1-naphthyl ethyl ether in dimethyl sulfoxide solution. Spectacular difference between the behavior of pyrrolidine and piperidine
作者:Joseph F. Bunnett、Shizen Sekiguchi、Lewis A. Smith
DOI:10.1021/ja00406a032
日期:1981.8
Drozd, V. N.; Grandberg, N. V. (Tokmakova); Udachin, Yu. M., Journal of Organic Chemistry USSR (English Translation), 1982, p. 1082 - 1089
作者:Drozd, V. N.、Grandberg, N. V. (Tokmakova)、Udachin, Yu. M.
DOI:——
日期:——
Talen, Recueil des Travaux Chimiques des Pays-Bas, 1928, vol. 47, p. 355