NMR spectra of intramolecularly hydrogen-bonded compounds—II
作者:N.M.D. Brown、D.C. Nonhebel
DOI:10.1016/0040-4020(68)88164-5
日期:1968.1
Schiff bases of aromatic amines and β-diketones including those containing Ph end-groups have been shown to exist as the keto-amine tautomer using NMR spectroscopy. The Schiff bases derived from aromatic amines and 2-hydroxyl-1-naphthaldehyde were concluded to be an equilibrium mixture of the ketoenamine and enolimine forms. The influence of electronic effects in the aromatic amines on the hydrogen-bond
Substituent Effects on the Ground-State Properties of Naphthalene-Based Analogues of Salicylideneaniline in Solution
作者:Asuka Ohshima、Atsuya Momotake、Tatsuo Arai
DOI:10.1246/bcsj.79.305
日期:2006.2
Substituenteffects on the ground-state properties of seven naphthalene analogues of salicylkleneaniline (1-7) were studied by comparison of both steady-state and transient absorption spectra. The naphthalene-based salicylideneanilines 1-5 were prepared from 2-hydroxy-1-naphthaldehyde and corresponding amine. The UV absorption spectra of 1-5 were largely dependent on the substituent group on the amino
通过比较稳态和瞬态吸收光谱,研究了取代基对水杨基苯胺 (1-7) 的七种萘类似物的基态特性的影响。萘基水杨基苯胺 1-5 由 2-羟基-1-萘醛和相应的胺制备。1-5 的紫外吸收光谱很大程度上取决于氨基上的取代基。瞬态吸收研究表明,1-5 中引入的萘基延长了 1 K trans 在非极性溶剂中的寿命,这可能是由于萘基上的氮和 CH 氢之间形成了分子内氢键。在乙腈中,1-6 的寿命比在苯中长得多,可能是因为两性离子形式在极性溶剂中稳定,
Olekhnovich, L. P.; Mikhailov, I. E.; Minkin, V. I., Journal of Organic Chemistry USSR (English Translation), 1982, vol. 18, # 2, p. 425 - 432
作者:Olekhnovich, L. P.、Mikhailov, I. E.、Minkin, V. I.、Furmanova, N. G.、Kompan, O. E.、et al.
DOI:——
日期:——
Catalyst-free direct ring-opening of cyclic aldimines with aliphatic primary amines to construct o-hydroxy schiff bases
作者:Ziyan Wu、Jingjing Wang、Feng Li、Hanhui Zhai、Qiuyue Ding、Dongyun Han、Zubin Cao
DOI:10.1016/j.tetlet.2022.153642
日期:2022.2
We firstly describe a catalyst-free direct ring-opening of cyclic aldimines with abundant aliphaticprimaryamines to construct o-hydroxy schiff bases under mild reaction conditions. The corresponding products were generated in good to excellent yields (80–99%). In addition, a gram-scale reaction and further application of the reaction strategy were performed.