死SYNTHESE sowie模具physikalischen Eigenschaften DER香豆素Abkömmlinge 5A - d,7α - d UND 11 AUS巢穴Azomethinen 1A - d UND 6A - d werden beschrieben。第三人以thermische Umsetzung冯5B - d奥德7B MIT 2,3-二甲基-1,3-丁二烯werden模具neuen Cycloaddukte 12A - Ç bzw. 13 gebildet,während图5c,d奥德7B MIT 1,2-双(亚甲基)环己模具Polycyclen 15A,bbzw。14 ergeben。
Reactions of co-ordinated ligands. Part IV. The use of aminomagnesium compounds in the preparation of α-amino-acid amides from α-amino-acid ethyl esters
作者:K. Blažević、R. P. Houghton、C. S. Williams
DOI:10.1039/j39680001704
日期:——
The action of benzylamine and magnesium methoxide on the Schiff bases formed from glycine ethyl ester and salicylaldehyde, 2-hydroxy-1-naphthaldehyde, and pentane-2,4-dione results in benzyl amide formation and, in the case of the first two Schiff bases, amine-exchange. It is suggested that the benzyl amide formation occurs by means of chelates which involve the Schiff bases and an aminomagnesium compound
Structure and Solution Equilibrium of N-Salicylidene-amino-sugars and Amino-alcohols.
作者:Shigeharu Inouye
DOI:10.1248/cpb.15.1540
日期:——
The structures and solution equilibria of twenty members of N-salicylidene-amino-sugars and -amino-alcohols were examined mainly in methanol, water and solid state. As the modeled compounds were examined simultaneously three members of N-salicylidene-alkylamines and eight members belonged to the o-methoxybenzylidene, 3-methoxysalicylidene, 3, 5-dibromosalicylidene and 2-hydroxynaphthylidene derivatives. From the comparative studies on the electronic, infrared, NMR spectra and equilibrium position, it was shown that the solution equilibrium consisted of the phenolimine and the ketoamine species, the latter being stabilized by the intra- and intermolecular hydrogen bonding involving the alcoholic hydroxyl groups and protic solvents. The acid-base equilibria of the two tautomers in methanol and the ketoamine-ion-pair equilibrium in water were discussed.
Synthesis and Evaluation of a Schiff-Based Fluorescent Chemosensors for the Selective and Sensitive Detection of Cu2+ in Aqueous Media with Fluorescence Off-On Responses
as alkali, alkaline and transition had no influence. Within a wide pH range 5–12 R1 could selectively detect copper by interrupting ICT mechanism that results in CHEF. From Job’s plot analysis a 2:1 binding stoichiometry was revealed. The fluorescence response was linear in the range 1–10 × 10−9 M with detection limit 30 × 10−9 M. Association constant was determined as 1 × 1011 M−2 by Benesi-Hilderbrand
铜是必不可少的营养素。还会对人体健康造成过量危害。使用基于Schiff碱的光学探针R1,采用了一种简便的方法来检测痕量铜。该探针通过苄基胺与2-羟基-1-萘甲醛的席夫碱缩合反应合成,并通过单X射线衍射,1 H NMR和FTIR进行表征。通过在DMSO和H 2 O(20:80,v / v)的混合物中筛选其荧光响应,R1仅在用铜处理时才显示出明显的荧光增强。其他检查的金属离子,例如碱金属,碱金属和过渡金属没有影响。在很宽的pH范围内5–12 R1可以通过中断导致CHEF的ICT机制来选择性地检测铜。从乔布斯的图分析中发现了2:1的化学计量比。荧光响应在1–10×10 -9 M范围内呈线性,检测极限为30×10 -9M 。缔合常数通过Benesi-Hilderbrand图确定为1×10 11 M -2。作为一种快速响应的探针,它具有良好的重现性,可用于检测不同水样中的铜。