苯甲酰咪唑过氧化反应

以苯甲酰咪唑和叔丁基过氧化氢为反应物,1,8-二氮杂二环十一碳-7-烯(DBU)为催化剂,乙睛(CH₃CN)作为反应溶剂,合成了过氧化叔丁酯类化合物。 分别考察了不同催化剂及其用量、原料配比、溶剂、温度和时间对反应的影响,在最优条件下,共得到25个目标产物,收率范围为45%~99%。 目标化合物经核磁共振氢谱、核磁共振碳谱以及质谱进行了结构表征。 该方法具有操作简单、反应条件简单温和、产物收率高及底物适用性好等优点,为过氧化叔丁酯类化合物的合成提供了新的思路。     

环己基过氧化氢分解工艺条件研究

通过对环己基过氧化氢分解反应的两种途径进行研究,探讨了反应条件对醇酮转化率、醇酮选择性、醇酮收率、醇酮纯度、醇酮比的影响。结果表明,微酸性催化分解工艺环己基过氧化氢分解反应的转化率、醇酮选择性、醇酮收率及酮醇比均高于加碱皂化工艺,加碱皂化工艺的醇酮纯度高于微酸性催化分解工艺。     

N末端缺失萝卜谷胱甘肽磷脂氢过氧化物酶的表达、纯化及结构预测

将N末端定位信号缺失萝卜PHGPx（RsPHGPx）的cDNA 片段克隆到表达载体pGEX-6P-1上, 并转化至大肠杆菌内进行表达. 通过GST亲和层析、离子交换层析和凝胶过滤层析, 制备了用于晶体学研究的RsPHGPx. 其浓度约为10 g/L, 纯度超过95％, 具有PHGPx活性. 三维结构同源建模显示RsPHGPx的结构为典型的硫氧还蛋白折叠形式.     

氢过氧化物-过氧乙酸对皮革中Cr6+形成的影响

使用过氧乙酸模拟油脂氧化的产物-氢过氧化物,使过氧乙酸分别对CrCl3、铬鞣剂、CrCl3-苯甲酸、铬鞣剂-苯甲酸、重铬酸钾溶液进行氧化处理,测定溶液中Cr6+的含量,研究氢过氧化物及羟基自由基清除剂(苯甲酸)对皮革中Cr6+形成的影响作用。利用紫外光谱考察了苯甲酸被Cr6+氧化前后     

高效液相色谱-荧光检测法测定环境样品中的过氧化物

对高效液相色谱-荧光检测法测定过氧化氢和有机过氧化物的方法进行了改进,从而提高了方法的检测灵敏度。以氯化血红素(hemin)作催化剂进行柱后衍生反应,过氧化物将对羟基苯乙酸氧化生成能吸收荧光的二聚物,然后用荧光检测器检测。实验确定了最佳反应管温度和荧光检测波长。应用该法测定了大气和雨水样品中过氧化物的浓度。     

TBHP/R4N+X– promoted hydroaroylation of dialkyl azodicarboxylates with methyl arenes,aldehydes, aryl methanols and arylmethyl chlorides

Efficient TBHP/R₄N⁺X^– promoted hydroaroylations of dialkyl azo-1,2-dicarboxylates with methyl arenes, aldehydes, aryl methanols and arylmethyl chlorides are described. These oxidation/oxygenation and hydroaroylation processes were carried out by tert-butyl hydroperoxide as terminal oxidant/oxygen source, and were catalyzed by tetrabutylammonium bromide and tricaprylmethylammonium chloride as the driving force. During this investigation, all these hydroaroylating sources were found to be highly efficient reagents without the need of any transition-metal.     

Aerobic Photooxidative Synthesis of β‐Alkoxy Monohydroperoxides Using an Organo Photoredox Catalyst Controlled by a Base

Transition‐metal‐free synthesis of β‐alkoxy monohydroperoxides via aerobic photooxidation using an acridinium photocatalyst was developed. This method enables the synthesis of some novel hydroperoxides. The peroxide source is molecular oxygen, which is cost‐effective and atomically efficient. Magnesium oxide plays an important role as a base in the catalytic system.     

有机金属钼催化下的甲基萘氧化反应

本文研究了在液相条件下用有机金属钼作均相催化剂,叔丁基过氧化氢作氧化剂,把甲基萘氧化成甲基萘醌的反应。讨论了溶剂、催化剂、反应温度、氧化剂与甲基萘的配比以及萘环上不同取代基对反应的影响,     

CH3OOH和CH3CH2OOH的表征和活性：光电子能谱的研究

The ionization energies of MHP （CH3OOH） and EHP（CH3CH2OOH） nave been determined by Hel photoelectron spectroscopy （PES） measurement and both Gaussian-2 （G2） calculation and Hartree-Fock （HF） method on the basis of Koopmans theorem at 6.311＋G^＊ basis set level for the first time. The assignment and characterization of PE spectra of MHP and EHP were also supported by the G2 and HF calculations. The first ionization energies of MHP and EHP are 9.87 and 9.65 eV, respectively. Higher solubility of EHP in the atmosphere was attributed to their lower ionization energy values.