framework to catalyze various asymmetric reactions for long time. For easily recycling the unique chiral catalysts, a series of polymer catalysts with chiral camphor unit were synthesized by RAFT polymerization. Herein, the performance of the synthesized polymer chiral catalysts was reported by catalyzing asymmetric Henry reaction. After optimizing the reaction conditions, the synthesized chiral polymer
Heterogenized dialdimine ligands complexed to iridium were tested in the asymmetrictransferhydrogenation of acetophenone. E.e.s of up to 70% were achieved but the recycling was unsatisfactory. When such ligands were used in asymmetric epoxidation of styrene, a modest e.e. of 15% was achieved.
Polymeric Nitrons. 2. Synthesis, Irradiation and Waveguide Mode Spectroscopy of Polymeric Nitrons Derived from Polymeric Benzaldehydes and <i>N</i>-Isopropylhydroxylamine
styrene. The molecular weights are about 10 000. The polymer analogous condensation of the aldehyde groups with an excess of N-isopropylhydroxylamine (8) at room temperature produces polymeric nitrons (9, 21, 22, 24, 26) in almost quantitative yields. All nitron functions were irradiated, and the intramolecular cyclization of the nitrons to the corresponding oxaziridines was examined. Waveguide mode
Adjusting the Proportion of Electron-Withdrawing Groups in a Graft Functional Polymer for Multilevel Memory Performance
作者:Linxin Wu、Peng Wang、Chunyu Zhang、Jinghui He、Dongyun Chen、Jiang Jun、Qingfeng Xu、Jianmei Lu
DOI:10.1002/asia.201500842
日期:2016.1
A polymer containing aldehyde active groups (PVB) was synthesized by atom transfer radical polymerization (ATRP), acting as a polymer precursor to graft a functional moiety via nucleophilic addition reaction. DHI (2‐(1,5‐dimethyl‐hexyl)‐6‐hydrazino‐benzo[de]isoquinoline‐1,3‐dione) and NPH (nitrophenyl hydrazine) groups, which contain naphthalimides that act as narrow traps and nitro groups that act
通过原子转移自由基聚合(ATRP)合成了含醛活性基团(PVB)的聚合物,该聚合物充当通过亲核加成反应接枝功能部分的聚合物前体。DHI(2-(1,5-二甲基-己基)-6-肼基-苯并[de]异喹啉-1,3-二酮)和NPH(硝基苯肼)基团,它们含有萘二甲酰亚胺,它们充当窄阱和硝基基团充当深陷阱,以不同比例固定在PVB上。获得了一系列接枝聚合物,并将其命名为PVB-DHI,PVB-DHI 4 -NPH,PVB-DHI-NPH 4和PVB-NPH。通过1 H-NMR光谱和X射线光电子能谱(XPS)分析了聚合物的化学组成。存储设备是由聚合物制成的,I –测量V特性以确定性能。通过将不同的电子受体(DHI和NPH)的比例调整为4:1,可以实现三元存储行为。详细研究了PVB-DHI x NPH y与受体基团之间的记忆行为及其传导机制。
Site-Isolated Porphyrin Catalysts in Imprinted Polymers
meso-tetraaryl ruthenium porphyrin complex having four polymerizable vinylbenzoxy groups (2) has been synthesized by reaction of pyrrole with 4-(vinylbenzoxy)benzaldehyde and subsequent metalation with [Ru3(CO)12]. The porphyrin complex was immobilized by copolymerization with ethylene glycol dimethacrylate. The resulting polymer P2 was found to catalyze the oxidation of alcohols and alkanes with 2,6-dichloropyridine