过渡金属氢化物的合成方法

概述了过渡金属氢化物尤其是钌氢配合物的氧化加成、M-X还原、质子化、过渡金属氢化物转化和原子簇过渡金属配合物氢聚等合成方法的进展情况.     

Highly Active Carbene Ruthenium Catalyst for Metathesis of 1-Hexene

A new carbene ruthenium complex, 1,3-bis（2,6-dimethylphenyl）-4,5-dihydroimidazol-2-ylidene）（PPh3）Cl2-Ru=CHPh, was synthesized and used as catalyst for the metathesis of 1-hexene. The resulting complex exhibited very high catalytic activity whose TOF is up to 6680 h^-1. However, at the same time significant olefin isomerization was observed and could be surpressed by changing reaction conditions, such as temperature, time, alkene/Ru molar ratio and solvent.     

等离子体条件Cu/SiO2对甲烷偶联的催化作用

It has been reported that methane coupling by plasma techniques with catalysts, such as direct current corona discharge with a Sr/La2O3 catalyst[1], dielectric-barrier discharge with zeolites[2] and pulsed corona discharge with metal oxide catalysts[3], give C2 hydrocarbons under atmospheric pressure. But acetylene predominates over other C2 hydrocarbons in the products. Our recent work reported that good results can be obtained for methane coupling under a pulsed corona plasma in the presence of hydrogen[4]. The addition of hydrogen improves the conversion of methane and the yield of C2 hydrocarbons. A methane conversion of 57.1% and a yield of C2 hydrocarbons of 43.4% were obtained at lower power, but acetylene was inevitably the main product. With the introduction of a Ni/γ-Al2O3 catalyst prepared by a cold plasma into the plasma reaction, the distribution of C2 hydrocarbons changed, and the content of C2H4 was 66.1%[5].     

P,N配位的环钯配合物催化Suzuki偶联合成含氟液晶化合物的研究

合成了P,N配位的环钯配合物1-2.它们不仅是在室温下高效催化对溴甲苯与对氟苯硼酸的交叉偶联反应而且也是合成含氟液晶化合物的高效催化剂.在最佳反应条件下,含氟液晶化合物的产率都超过90%.     

烯烃齐聚锆及铬族均相催化剂研究进展

综述近年来烯烃齐聚锆及铬族均相催化剂研究的最新成果，分别介绍锆及铬类均相催化体系的特色和研究侧重点，并对各种催化体系中不同中心金属及其配体对催化活性和选择性的影响进行了分析比较。     

乙烯线性齐聚的研究 X．烷氧基锆的催化性能

乙烯线性齐聚的研究Ｘ．烷氧基锆的催化性能何仁，于净，卫锋（大连理工大学化工学院，大连１１６０１２）关键词乙烯，齐聚，直链ａ－烯烃，锆络合物，叔膦乙烯线性齐聚是合成直链低碳ａ一烯径最先进的方法．直链低碳ａ一烯烃是重要的共聚单体和合成许多精细化学品的原料...     

《中学生数学》来稿须知

《中学生数学》杂志的办刊主旨是：为高中数学全面深入有效地学习创设平台。围绕“高中数学学习”这一主题,面向广大的中学生,引领学习数学的方向、唤起学习数学的激情、提高学习数学的兴趣、开阔学习数学的眼界、提高学习数学的成绩。同时,也为中学广大师生探求和交流中学数学学习的方法和规律、畅谈学习心得体会提供用武之地。     

茂金属催化剂催化烯烃齐聚与环化的研究进展

本文介绍近年来国内外在茂金属催化剂催化烯烃齐聚与环化方面的研究进展, 主要侧重于茂金属催化剂催化烯烃齐聚, α, ω-二烯的环化及应用前景。     

Study on the hydrogenation coupling of methane

At atmospheric pressure and ambient temperature, the hydrogenation coupling of methane was studied by using pulse corona plasma and its synergism with catalyst. The results showed that (i) under pulse corona plasma, the coupling of methane could be fulfilled by the addition of hydrogen, and with the increase of the amount of hydrogen, the conversion of methane and the yield of C2 hydrocarbon increased, and the deposit of carbon decreased; (ii) the conversion of methane was affected by pulse voltage and repeated frequency; (iii) in the system, the addition of Ni/y-AI203 could improve the distribution of C2 hydrocarbon; (iv) the activity of Ni/y-AI2O3 prepared by cold plasma was better than that by chemical methods. The experiment opened up a new technical route of the coupling of methane.     

乙烯线性齐聚研究Ⅺ.Kaminsky催化剂催化乙烯齐聚

乙烯线性齐聚研究　Ⅺ．Ｋａｍｉｎｓｋｙ催化剂催化乙烯齐聚沈玉梅，何仁（大连理工大学化工学院，大连１１６０１２）关键词乙烯，齐聚，Ｋａｍｉｎｓｋｙ催化剂，络合催化直链低碳α－烯烃是线性低密度聚乙烯的共聚单体，也是合成高级醇、高级润滑油、增塑剂和表面活性...