Nucleophilic Reactivities and Lewis Basicities of 2-Imidazolines and Related N-Heterocyclic Compounds
作者:Biplab Maji、Mahiuddin Baidya、Johannes Ammer、Shinjiro Kobayashi、Peter Mayer、Armin R. Ofial、Herbert Mayr
DOI:10.1002/ejoc.201300213
日期:2013.6
predict the rate constants for their reactions with Michael acceptors of known electrophilicity E. A comparison of the nucleophilicity parameters of the imidazoline derivatives 1 with other commonly used nucleophilic organocatalysts shows that they are 10 to 103 times less nucleophilic than PPh3, 1,8-diazabicyclo[5.4.0]undec-7-ene, or 4-(dimethylamino)pyridine. The structure–reactivity relationships of
由线性自由能方程 log k(20 °C) = sN(N + E) 定义的 2-咪唑啉 1a-d 和相关的 N-杂环化合物 2-5 的亲核参数 N 和 sN 具有通过在 20°C 下通过停流或激光闪光光解技术研究它们与不同取代的二苯甲基离子在二氯甲烷中的反应速率来确定。结果表明,由此获得的 N 和 sN 参数可用于可靠地预测它们与已知亲电性 E 的迈克尔受体反应的速率常数。 咪唑啉衍生物 1 的亲核性参数与其他常用亲核有机催化剂的比较表明,它们的亲核性比 PPh3、1,8-二氮杂双环 [5.4.0] undec-7-ene 或 4-(二甲氨基)吡啶低 10 到 103 倍。
COATING LIQUID, OPTICAL ANISOTROPIC FILM AND IMAGE DISPLAY DEVICE
申请人:ONOUCHI Hisanari
公开号:US20120313040A1
公开(公告)日:2012-12-13
A coating liquid comprising: a lyotropic liquid crystalline compound having a π-conjugated system planar skeleton moiety and one or plural nitrogen-containing heterocyclic cation moiety or nitrogen-containing heteroaromatic cation moiety bonded to the planar skeleton moiety; and a solvent, an optical anisotropic film obtained by applying the coating liquid on a developing surface to form a coated film and solidifying this coated film, and an image display device provided with the optical anisotropic film are disclosed.
On the Oxidation of Different Iminic Bonds by Excess of 3-Chloroperbenzoic Acid
In the present work the behavior of different substituted iminic bonds toward the oxidative action of 3-chloroperbenzoic acid is reported. The C=N bond was or was not oxidized to oxaziridines, amides, oximes, nitroso-, nitro-, and azodioxy compounds depending on the substituents at the iminic group and on the imine/MCPBA stoichiometric ratio.
1-Acetyl-2,3-Dimethylimidazolidine: A Novel Organic Reductant for Transfer Hydrogenation
作者:Wei Guo、Donghong Li、Yongbin Zhang、Guofu Zhou
DOI:10.1055/s-2007-1000863
日期:2008.1
1-Acetyl-2,3-dimethylimidazolidine was synthesized and was shown to be able to directly reduce a series of aromatic, aliphatic and α,β-unsaturated aldehydes as well as imines in high yields.