Anti-Markovnikov Hydroamination of Racemic Allylic Alcohols to Access Chiral γ-Amino Alcohols

A ruthenium-catalyzed formal anti-Markovnikov hydroamination of allylic alcohols for the synthesis of chiral γ-amino alcohols is presented. Proceeding via an asymmetric hydrogen-borrowing process, the catalysis allows racemic secondary allylic alcohols to react with various amines, affording enantiomerically enriched chiral γ-amino alcohols with broad substrate scope and excellent enantioselectivities (68 examples, up to >99 % ee).     

核磁共振弛豫速率方法测定模拟正铁色素的结构

在生命体系内正铁色素具有摄铁和输铁的功能,人工合成的模拟化合物具备了正铁色素的主要功能基团和相近的性质.本工作利用铁(Ⅲ)离子的顺磁性质,测定不同铁(Ⅲ)离子浓度下模拟正铁色素的诱导弛豫时间,根据简化了的Solomon—B1oemoergen公式,计算出铁(Ⅲ)离子到所有被测质子(即氢原子)的相对距离,比较清楚地得到模拟正铁色素在溶液中的构象。     

与单形外接球心有关的一个不等式

若n维单形A＝A1A2…An r的外接球心O位于其内部，单形A与单形Ai＝A1A2…Ai-1OAi 1…An 1的外接球半径分别为R与Ri(i=1,2,…,n 1），本文证明了：n 1↑П↑i=1Ri≥(nR/2)^n 1，而等号成立的充分必要条件为单形A正则。     

聚双环戊二烯反应注射成型

本文介绍了国外有关聚双环戊二烯反应注射成型的研究进展，讨论了国内进行聚双环戊二烯反应注射成型开发研究的现实意义，并对这一领域的发展进行了展望     

胶束催化及胶束模拟酶性能的研究

本文对胶束催化的有机反应进行综述,并对其模拟酶的催化功能作了评论。     

6－脱氧－6－羟乙基氨基β－CD的合成及表征

６－脱氧－６－羟乙基氨基β－ＣＤ的合成及表征罗美明，谢如刚，赵华明（四川大学化学系成都６１００６４）关键词环糊精，合成，结构表征环糊精（ＣＤ）是由多个Ｄ－吡喃葡萄糖以α（１，４）糖苷键连接而成的一类环状低聚糖，是略呈锥形的圆筒状分子，其伯羟基和仲羟基...     

Pd（OAc）2／FePc催化环己烯氧化合成环己酮的研究

考察了几种Ｆｅ－大环配合物与Ｐｄ（ＯＡｃ）２组成的双组分催化体系，在乙腈酸性水溶液中环己烯经合成环己酮的催化活性，实验结果表明，其中以酞菁失（ＦｅＰｃ）与Ｐｄ（ＯＡｃ）２组成的催化体系活性最高，而ＦｅＴＰＰＣｌ与Ｐｄ（ＯＡｃ）２催化体系，虽然催化活性较高，但催化剂的稳定性较低，各种因素对Ｐｄ（ＯＡｃ）２／ＦｅＰｃ催化活催化影响的研究结果指出，在无水和酸存在的非水溶液中，Ｐｄ（ＯＡｃ）２／ＦｅＰｃ对     

杯芳烃—卟啉键连化合物的合成及其紫外—可见光谱特性

本文合成了一种新型的杯芳烃-卟啉模型化合物5及其金属锌的络合物6,用紫外-可见光谱考察了引入对-叔丁基杯[4]芳烃后对卟啉各特征吸收带的影响。     

尖吻蝮蛇毒抗凝血因子(ACF)含量和钙离子含量的定量测定及钙离子结合位点的初步研究

由紫外光谱法测定蛋白质浓度,用ICP测定Ca含量,从而确定一个ACF分子中含一个钙离子.ACF中分子中除一个高亲和性钙结合位点外,至少还有一个低亲和性钙结合位点,只有当过量钙离子存在时,才可能在低亲和性钙结合位点上进一步结合钙离子.Tb~(3+)具有比Ca~(2+)离子更强的键合ACF能力,能定量结合在ACF中的两个位点上,且能全部取代ACF中Ca~(2+).文中提及的金属离子对ACF的抗凝血活性没有显著的影响.     

Hexacyanoferrate‐based ionic liquids as Fenton‐like catalysts for deep oxidative desulfurization of fuels

Two hexacyanoferrate‐based ionic liquids, [C₄Py]₃Fe(CN)₆ and [C₁₆Py]₃Fe(CN)₆, were synthesized and characterized using Fourier transform infrared and mass spectroscopies and CHN analysis. They were employed as Fenton‐like catalysts in extraction and catalytic oxidative desulfurization of model oil with dibenzothiophene (DBT), benzothiophene (BT), 4,6‐dimethyldibenzothiophene (4,6‐DMDBT), 4‐methyldibenzothiophene (4‐MDBT) and 3‐methylbenzothiophene (3‐MBT) as substrates. Various polar solvents, such as ionic liquids, water and organic solvents, were applied to choose a suitable extractant. The results showed the removal of DBT reached 97.1% with [C₄Py]₃Fe(CN)₆ as a catalyst and 1‐n‐octyl‐3‐methylimidazolium hexafluorophosphate ([C₈mim]PF₆) as an extractant under optimal conditions. The activity of sulfur removal followed the order DBT > 3‐MBT > BT > 4‐MDBT >4,6‐DMDBT. The effect of water content on sulfur removal was investigated by adding various concentrations of H₂O₂. It was found that excess water had a positive effect on sulfur removal but the catalysts were less sensitive than [FeCl₄^?]‐based catalysts to water. The mechanism was studied using electron spin‐resonance spectroscopy and gas chromatography–mass spectrometry. O₂^?? may be the active oxygen species in the catalytic oxidative desulfurization process and the oxidation products of various sulfur compounds were the corresponding sulfoxides and sulfones. Copyright © 2016 John Wiley & Sons, Ltd.