一种新型苯并噻嗪功能化的基于 Calix[4] 芳烃的荧光化学传感器,用于选择性检测 Co 2+ 离子
摘要:
杯芳烃在超分子化学中占有重要地位,由于其易于合成和功能化,已成为合成有机化学中最重要的大环化合物。本研究合成了对叔丁基杯[4]芳烃二酰肼衍生物,然后与3-氧代-3,4-二氢-2H-苯并[b][1,4]噻嗪-2-亚基乙酰氯反应制备新的杯芳烃基发色团化合物4 .通过1 H NMR、 13 C NMR和FT-IR光谱等光谱方法阐明了合成化合物的结构。评估了化合物4的显色和荧光特性。从两项研究中观察到化合物4具有Co 2+选择性并表现出荧光关闭行为。计算化学计量、结合常数和检测限。发现化合物4和Co 2+之间的化学计量为1:1。使用Benesi-Hildebrand方程计算出结合常数值(K)为666.67 M - 1 ,而Co 2+离子的检测限计算为0.0465 µM。
Recyclable CuO nanoparticles provide an efficient, economic, and novel method for the synthesis of quinoxaline, benzoxazine, and benzothiazine. This method provides a wide range of substrate applicability, avoids the use of organic solvents, and gives benzoheterocycles in satisfactory yields.
Abstract The 1,3-dipolarcycloaddition of azomethine ylides generated in situ from the reaction of acenaphthylene-1,2-dione or isatins and α-amino acids to (E)-methyl/ethyl 2-(3-oxo-3,4-dihydro-2H-benzo[b][1,4]thiazin-2-ylidene)acetate led to the stereoselective formation of novel dispiro 1,4-benzothiazine hybrid heterocycles in good yields. GRAPHICAL ABSTRACT
A Novel Ring-Opening/Ring-Closing Cascade Reaction Selectively Induced by Aliphatic Primary Amine Using Phenolic Hydroxyl as a Traceless Directing Group
An interesting ring-closing/ring-opening cascade reaction selectively induced by aliphatic primaryamine for the synthesis of functionalized aminomaleimides is described. This work features phenolic hydroxyl as a traceless directing group that forms a critical six-membered intermediate and then a lactone ammonolysis/intramolecular amidation sequence. This two-step, one-pot practical protocol has broad