Microwave-assisted synthesis and characterization of optically active poly (ester-imide)s incorporating l-alanine
作者:Saeed Zahmatkesh、Abdol R. Hajipour
DOI:10.1007/s00726-009-0336-6
日期:2010.4
53 dl g−1. These polymers are opticallyactive, thermally stable and soluble in polar aprotic solvents such as DMF, DMSO, NMP, DMAc, and sulfuric acid. All of the above polymers were fully characterized by IR spectroscopy, 1H NMR spectroscopy, elemental analyses, specific rotation and thermal analyses. Some structural characterizations and physical properties of these opticallyactive PEIs and Co-PEIs have
均苯四甲酸二酐(1)与L-丙氨酸(2)反应,得到[ N,N' -(均苯四甲酰基)-双-1-丙氨酸二酸](3)。通过与亚硫酰氯反应,将该化合物(3)转化为N,N' -(均苯四甲酰基)-双-1-丙氨酸二酰氯(4)。该二酰氯(4)与聚乙二醇二醇(PEG-200)和/或三种合成的芳香族二醇的微波辅助缩合反应可在实验室微波炉(里程碑)中提供一系列新的PEI和Co-PEI。所得的聚合物和共聚物的固有粘度为0.31-0.53 dl g -1。这些聚合物具有光学活性,热稳定性,可溶于极性非质子溶剂,例如DMF,DMSO,NMP,DMAc和硫酸。上述所有聚合物均通过IR光谱,1 H NMR光谱,元素分析,比旋光度和热分析进行了全面表征。已经报道了这些旋光性PEI和Co-PEI的一些结构特征和物理性质。
Electrochemical Hydroxylation of Electron‐Rich Arenes in Continuous Flow
An electrochemical approach for the hydroxylation of electron-rich arenes was developed. The transformation relies on the anodicoxidation of arene and the use trifluoroaceticacid as an oxygen source. The reaction is carried out in an electrochemical flow reactor, which allowed to synthesize sensitive products by shortening reaction/residence time to 1.25 minutes and to perform a scale up experiment