Stereoselective Synthesis of Piperamide Alkaloids by Modified Ramberg-Bcklund Reaction

A convenient and rapid approach for the synthesis of piperamide alkaloids la ~ h by the recently developed one-flask Ramberg-Backlund reaction was described. The synthesis of 1e was reported for the first time.     

超临界二氧化碳-高分子化学中的绿色介质

介绍了超临界二氧化碳的特点，综述了近期以超临界二氧化碳为溶剂的高分子聚合和高分子化学反应及其应用前景。指出超临界CO2在聚合反应中能作为传统有机溶剂的替代溶剂。     

黄孢展齿革菌菌丝球同时吸附铅镉离子的动力学

采用间歇法，利用黄孢展齿革菌菌丝球吸附溶液中的Pb^2 和Cd^2 ，研究Pb^2 和Cd^2 共存体系中吸附初速率随初始浓度的变化规律。实验结果表明，少量Cd^2 的存在促进其对Pb^2 的吸附，并提高吸附初速率，但随着Cd^2 初始浓度的增加，促进作用逐渐减弱并转为抑制作用；Cd^2 的吸附初速率随着Pb^2 初始浓度增大而减小；Pb^2 和Cd^2 的吸附初速率都随自身初始浓度的增加而增大。     

杯芳烃的分子设计(Ⅵ)--一种新的杯[4]磺胺衍生物的合成及晶体结构

杯芳烃是由酚单体通过亚甲基在羟基邻位桥连而成的环状低聚物, 它具有可调的杯状疏水空腔, 结构柔性较大, 构象可变, 并对中性分子和有机、无机离子具有选择性配位能力. 因此, 在其上下缘进行化学修饰所得到的杯芳烃衍生物可广泛应用于萃取分离、离子选择性电极、色谱分析、功能材料、催化及模拟酶等研究领域[1～4].     

多元混配合物[Ni(NPA)2(Phen)(Ac)(H2O)]·H2O的合成、晶体结构

0引言镍是生物体中必须的痕量元素,常成为一些酶的活性中心,因而模拟镍酶并研究其结构,一直是生物无机化学等领域的重要研究课题,近年来镍配     

从蓖麻油制取10-羟基癸酸的研究

本文报道了从蓖麻油制取10-羟基癸酸的研究,发现了从蓖麻油制取10-羟基癸酸的新的工艺路线和最佳的工艺条件,用氢氧化钠用量、2-辛醇量、反应时间和反应温度四因子三水平L_9(3~4)进行了正交试验,发现最佳工艺条件是:氢氧化钠(g)/蓖麻油(g):1.25:2-辛醇量(g)/蓖麻油(g):2:反应时间:6h;反应温度:180℃。在这一新的工艺路线和最佳工艺条件下,10-羟基癸酸产率可达75％。     

Decomposition of Transformer Oil Under Ultrasonic Irradiation During Degassing Process

In the degassing process of transformer oil with ultrasonic waves ,decompostition of the oil was observed.Light hydrocarbons,including methane,ethane,ethylene ,aceylene,propane etc,were found to be released continuously from the oil into headspace within a closed vial placed in an ultrasonic field ,The gases came from decomposition of hydrocarbon molecules under cavitation effect.     

SYNTHESIS AND CATALYTIC PROPERTY OF POLYSTYRENE SUPPORTED GLUTAMIC ACID SCHIFF BASE COMPLEX OF Mn（ Ⅱ ） IN AEROBIC OXIDATION OF CYCLOHEXENE

The polystyrene supported glutamic acid Schiff base complex of Mn （ Ⅱ ） （PS-Sal-Glue-Mn） was prepared with chloromethylated styrene polymer beads, 2,4-dihydroxybenzaldehyde, L-glutamic acid and manganese （ Ⅱ ） acetate tetrahyrate. The polymeric ligand and the complex were characterized by FT-IR, small area X-ray photoelectron spectroscopy （XPS） and 1CP-AES. In the presence of the manganese complex, cyclohexene （1） was effectively oxidized by molecular oxygen without reductant. The major products of the reaction were 2-cyclohexen-l-ol （2）, 2-cyclohexen-l-one （3） and 2-cyclohexen-1- hydroperoxide （4）, which was different with typical oxidation of cyclohexene. The influence of reaction temperature and additive for oxidation had been studied. The selectivity of 2-cyclohexen-1-hydroperoxide varied with reaction time and different additives. The mechanism of cyclohexene oxidation had also been discussed.     

二氧化碳与环氧化物的调节共聚合反应速率

在二氧化碳和环氧化物共聚时加入特定的调节剂，生成有规定的分子量和端基官能度的产物．这种调节聚合的本质是调节剂所含活泼氢与活性中心之间的链转移反应．根据建议的历程，提出了调节共聚速率方程，计算结果与实验一致．     

Photo-induced Charge Separation of p-Tricyanovinyl-N,N-Dialkylanilines

In this paper,p-tricyanovinyl-N,N-dialkylanilines were synthesized as model compounds and through their spectroscopic behavior,the photo-induced electron transfer,charge separation were discussed and the aggregation in DMSO-H_2O system was investigated.