Synthesis of phosphorus- and selenium-containing macrocycles and their complexation with Pd(II)Cl2
作者:J. L. Li、J. B. Meng、Y. M. Wang、J. T. Wang、T. Matsuura
DOI:10.1039/b005045h
日期:——
this synthesis an eight-membered heterocycle 4 was also obtained. In addition, the condensation of compound 1 with selenium-containing diols 7 and 8 in the presence of sodium tert-butoxide gave macrocyclic ligands 9 and 10, respectively. Reaction of these macrocycles with palladium(II) chloride gave 1 ∶ 1 complexes, except 9 which gave a 2 ∶ 1 complex. The molecularstructures of the macrocycles 3c
Effect of Molecular Interactions on Electron-Transfer and Antioxidant Activity of Bis(alkanol)selenides: A Radiation Chemical Study
作者:Pavitra V. Kumar、Beena G. Singh、Prasad P. Phadnis、Vimal K. Jain、K. Indira Priyadarsini
DOI:10.1002/chem.201601918
日期:2016.8.16
hydroxyl (.OH) radical and three bis(alkanol)selenides (SeROH) of varying alkyl chain length, using nanosecondpulseradiolysis. .OH radical reacts with SeROH to form radical adduct, which is converted primarily into a dimer radicalcation (>Se∴Se<)+ and α‐bis(hydroxyl alkyl)}‐selenomethine radical along with a minor quantity of an intramolecularly stabilized radicalcation. Some of these radicals have been
DHS red exhibited higher glutathione peroxidase (GPx)-like antioxidative catalyticactivities than the corresponding linear selenide, that is, Se(CH 2 CH 2 OH) 2 . The rate-determining step of the catalytic cycle was unambiguously assigned to the oxidation process of the selenide rather than the reduction process of the selenoxide intermediate. The enhancedcatalyticactivities of DHS red can be ascribed
在过氧化氢与三种不同的硫醇底物单硫醇谷胱甘肽 (GSH)、二硫醇二硫苏糖醇 (DTT 红)、和多硫醇还原的核糖核酸酶 A (RNase A),沿多肽链具有八个硫醇基团。对于所有的硫醇底物,DHS red 表现出比相应的线性硒化物,即 Se(CH 2 CH 2 OH) 2 更高的谷胱甘肽过氧化物酶 (GPx) 样抗氧化催化活性。催化循环的速率决定步骤明确归于硒化物的氧化过程,而不是氧化硒中间体的还原过程。DHS红催化活性增强可归因于环状结构,
Effects of Ring Size and Polar Functional Groups on the Glutathione Peroxidase-Like Antioxidant Activity of Water-Soluble Cyclic Selenides
the effects of ring structure and a substituent on the glutathione peroxidase- (GPx-) like antioxidant activities of aliphatic selenides, series of water-solublecyclicselenides with variable ring size and polar functional groups were synthesized, and their antioxidant activities were evaluated by NADPH-coupled assay using H2O2 and glutathione (GSH) in water and also by NMR spectroscopy using H2O2
为了阐明环结构和取代基对谷胱甘肽过氧化物酶-(GPx-)的影响,如脂肪族硒化物的抗氧化活性,合成了一系列具有可变环尺寸和极性官能团的水溶性环状硒化物,并评估了其抗氧化活性通过使用H 2 O 2和水中的谷胱甘肽(GSH)进行NADPH偶联测定,以及使用H 2 O 2和二硫苏糖醇(DTT红)进行NMR光谱分析)在甲醇中。在水中类似于GPx的活性,硒化物氧化的二级速率常数以及在水中计算出的HOMO能级之间发现了很强的相关性。结果支持了氧化过程是催化循环的速率决定步骤的结论。另一方面,对于在甲醇中观察到的活性没有获得这样的相关性。确定最佳环尺寸为五。取代基的类型(NH 2
A Versatile Strategy to Main Chain Sulfur/Selenium-Functionalized Polycarbonates by Macro-Ring Closure of Diols and Subsequent Ring-Opening Polymerization
作者:Chao Wei、Yan Zhang、Bingkun Yan、Zhengzhen Du、Meidong Lang
DOI:10.1002/chem.201704301
日期:2018.1.19
class of main chain functionalized aliphatic polycarbonates with sulfur/selenium functional groups on the backbone is reported. Sulfur/selenium‐containing cyclic carbonate monomers (MR) are designed and synthesized by enzyme‐catalyzed intermolecular macro‐ring closure of related diols. The proposed synthetic strategy is tolerant of other functionalities such as N‐substituted groups. The ring opening polymerization
在此,报道了在主链上具有硫/硒官能团的新型的主链官能化的脂肪族聚碳酸酯。含硫/硒的环状碳酸酯单体(M R)是通过酶催化相关二醇的分子间大环闭合而设计和合成的。拟议的合成策略可耐受其他功能,例如N-取代的基团。M R的开环聚合(ROP)可以作为一种通用途径来生成具有可预测的分子量(MW),窄的分子量分布和受控的共聚物组成的新的主链硫/硒取代的脂族聚碳酸酯(PR)系列。可以通过用过氧化氢(H2 O 2)或二硫苏糖醇(DTT),突出了它们在刺激反应领域和炎症/癌症靶向中的应用潜力。通过这些令人满意的结果,我们发现,这种通用技术可以为下一代创新材料,尤其是定义明确的可生物降解的基于硫属元素的主链功能生物材料提供广泛的方法。