正己烷溶液中4一氯联苯的紫外光降解研究

研究了正己烷溶液中4一氯联苯的紫外光降解反应。首次讨论了正己烷溶液中多氯联苯的特征紫外吸收和光反应中氯的形成的研究，光降解的主要反应途径为一级反应的脱氯。分子中C-Cl键断裂形成联苯自由基，该自由基从溶剂分子上脱去氢形成联苯，在光照下联苯继续降解最终生成脂肪烃。联苯的紫外光降解实验进一步证明了这种机理。     

双环笼状磷酸酯衍生物的研究Ⅵ:4-取代-2,6,7-三氧杂-1-磷杂双环[2.2.2]辛烷的反应研究

双环笼状亚磷酸酯类衍生物由于其笼状结构所引起的张力及高位阻性 ,使得它同一般直链亚磷酸酯类化合物相比,在亲核取代反应性等方面有关明显的不同.本文用化合物1分别同SO~2Cl~2,Cl~2, Br~2, PCl~5等反应,结果表明,1均发生了类Arbuzov反应,生成具有相同立体构型的开环产物.本文还对化合物2的磷酰化反应进行了研究,发现在这类高位阻性的双环笼状亚磷酸酯衍生物的磷酰化反应中,DMAP是一个较有效的催化剂.     

1-氧代-1-磷杂-2, 6, 7-三氧杂双环[2.2.2]-4-含硫取代基辛烷 的合成

本文利用中间体1-氧代-1-磷杂2,6,7-三氧杂双环[2.2.2]-4-羟甲基辛烷(1)和1-氧代-1-磷杂-2,6,7-三氧杂双环[2.2.2]-4-氯甲酰基辛烷(3)分别与RSH或取代硫醇按步骤反应得到了相应的4-亚甲基硫醚(5a～f)、4-亚甲基亚砜(6a～f)、4-(氯代乙硫基)甲酰基(7)及4-(β-烷硫基)-α-硫代酯基(8a～i)的双环笼状磷酸酯新衍生物共22个。所有的化合物经元素分析、IR和^1HNMR得到了证实。     

STUDY ON THE POST-CURE KINETICS OF EPOXY RESIN IRRADIATED BY AN ELECTRON BEAM

INTRODUCTIONElectron Beam (EB) curing of polymer matrix composites is a novel green manufacturing process. EB curing ofcomposites offers significant advantages over traditional thermal curing[1-3], including shorter curing time, lowenergy consumption, low curing temperature, good dimensional stability, better processing character, and so on.According to the curing reaction mechanism of epoxy resin initiated by onium salt, the curing reactionincludes three reaction steps of chain initiati…     

伴有气体体积变化的演示

(1)将40-50毫升水中溶有7-8克苛性钠的碱溶液倒入容积下大的烧瓶内。将与启普发生器连接的导气管通入烧瓶,并通进猛烈的碳酸气以将空气排出。其后用带有橡皮管的木塞将烧瓶塞好,橡皮管和充满碳酸气的排球胆连接(图1)。频频以手用力摇动烧瓶,碳酸气即与     

三苯基锡芳氧乙酸酯的合成和表征

三苯基锡芳氧乙酸酯的合成和表征刘宝殿，包明，张景萍（东北师范大学化学系、东北师范大学分析测试中心，长春，１３００２４）关键词芳氧乙酸，三苯基锡芳氧乙酸酯，合成，生物活性三苯基醋酸锡和三苯基氢氧化锡是防治甜菜褐斑病的有效药剂［１］．芳氧乙酸及其酯也具有...     

由合成气制备C2含氧化合物用铑基催化剂中各组分间的相互作用

采用ＴＰＲ，ＥＰＲ，ＩＲ，ＸＰＳ等手段对由合成气制备Ｃ２含氧化合物的Ｒｈ基催化剂中各活性组分间的相互作用进行了研究。ＴＰＲ实验表明，Ｍｎ的存在除了促进金属铑在担体表面的分散，增加还原过程耗氢量外，还使Ｒｈ物种的还原温度显著升高；少量Ｌｉ的加入导致氢向载体ＳｉＯ２的溢流，使体系的还原特性发生了明显的变化。原位ＥＰＲ和ＸＰＳ研究显示，添加剂与Ｒｈ相互作用，在催化剂表面形成了稳定的复合氧化物。助剂Ｍｎ主     

Synthesis and Crystal Structure of a Novel Three-dimensional Supramolecular Compound [（AgI3）（4-HBPFA）2（H2O）]

1 INTRODUCTION In recent years, the rational design and synthesisof metal-directed supramolecular frameworks throughintermolecular hydrogen bonds, π-π stacking interac-tion or other weak interactions have received muchattention because of their interesting molecular topo-logies and various potential applications in catalysis,superconductor, magnetism, nonlinear optics, sen-sors and molecular recognition[1～4]. On the otherhand, the attachment of mono- or polypyridyl frag-ments to a ferr…     

The mechanism of asymmetric reduction catalyzed by a C_2 symmetric bis-amino alcohol catalyst——In situ NMR study of the structure of new type of dual-centered catalyst

By means of 1H, 13C, 11B NMR, polar transfer DEPT135, DEPT90 and 2D NMR experiments, IR, etc, the structure of the diaminodihydroxyl ligand and its derivatives used in the asymmetric reduction of prochiral ketones were detected. The catalysts derived from the ligand and bo-rane formed in situ were also studied and the structure transformations in solution were monitored.The structure of the catalyst was proved to be a new type of dual-centered catalyst——bis-oxazaborolidine.