series of Schiff bases in the condensationreaction between benzaldehydes and anilines, in the absence of solvent. Benzaldehydes and anilines, containing either electron‐withdrawing or electron‐releasing groups, were assessed to identify any substituent effect on the formation of the Schiff bases. This methodology is characterized by ease of set‐up and work‐up, and the reaction yields were comparable with
2-hydroxybenzaldehyde showing strong intramolecular hydrogen bonding are studied on the basis of solution 13 C NMR spectroscopic data and semiempirical MO (AM1) calculations of the relative stability of tautomers. Excited state protontransfer is also investigated using electronic absorption and fluorescence spectroscopies, and calculation of vertical excitation energies (INDO/S). The theoretical predictions
摘要 基于溶液 13 C NMR 光谱数据和互变异构体相对稳定性的半经验 MO (AM1) 计算,研究了显示强分子内氢键的 2-羟基苯甲醛的单取代和双取代苯胺中的取代基效应。还使用电子吸收和荧光光谱以及垂直激发能 (INDO/S) 的计算来研究激发态质子转移。理论预测与实验观察一致。
Asymmetric and diastereoselective Mannich reactions using hydantoin as a chiral auxiliary
作者:Xuan-Ran Li、Cui-Fen Lu、Zu-Xing Chen、Yan Li、Gui-Chun Yang
DOI:10.1016/j.tetasy.2012.09.006
日期:2012.10
The Mannich reaction of titanium enolates of a chiral hydantoin with various aldimines smoothly occurred in good yields and with high anti-diastereoselectivity. The Mannich adducts can be readily cleaved by alcoholysis to afford several beta-amino ester derivatives in good yields and in almost enantiomerically pure form. (C) 2012 Elsevier Ltd. All rights reserved.
SAUSIN A. EH.; CHEKAVICHUS B. S.; LUSIS V. K.; DUBUR G. YA., XIMIYA GETEROTSIKL. SOEDIN., 1980, HO 4, 493-501
作者:SAUSIN A. EH.、 CHEKAVICHUS B. S.、 LUSIS V. K.、 DUBUR G. YA.
DOI:——
日期:——
SECONDARY NON-LINEAR OPTICAL MATERIAL AND NON-LINEAR OPTICAL ELEMENT PREPARED THEREFROM