环烯

Reactor Construction: Multitube reactor systems for chemical industry ( all technical heat transfer fluids,particularly mkoltensalt 50 years experience) for production of:phthalic anhydride,maleic anhydride,acrolein,methyl methacrylate,methanol,ethylene oxide and other endothermic and exothermic catalytic

简介： 反应器制造部：列管反应器系统，用于化学工业（所有工业用热交换流体，特别是熔盐传热）中生产苯酐，顺酐，丙烯醛，丙烯酸，甲基丙烯酸甲酯，甲醇，环氧乙烷及其他放热与吸热气相催化生产工艺。

In this thesis, the process of side-chain alkenylation and cyclization reaction have been studied. NaK eutectic mixture is seldom used as acatalyst, not to mention the sonochemical treatment of it in a catalytic system.

本研究通过烯基化反应合成OTP并对其进行环化反应合成1，5-DMT，同时对反应催化剂进行表征并对反应机理进行探讨。

The present doctoral dissertation was carried out to study the chemical constituents isolated from stems of two medicinal schisandraceous plants.34 compounds were isolated from the ethanol extracts of the stems S.henryi collected in the Jiangxi province by various column chromatographies.27 of them were identified on the basis of spectral analysis.There are 18 lignans,(including 5 dibenzocyclooctadienes,6 aryltetralins,2 tetrahydrofurans,3 diarylbutanes,2 other lignans),3 flavanols,2 glyceroesters,1 naphthoquinone,1 xanthine and 2 steroids,of which 6 compounds were new compounds,and 7 compounds were isolated from this family for the first time.

采用多种色谱技术进行分离纯化，从翼梗五味子藤茎的乙醇提取物中分离到34个化合物，综合运用现代波谱学技术鉴定了27个化合物，包括木脂素类化合物18个(其中联苯环辛烯类木脂素5个，芳基四氢萘类木脂素6个，四氢呋喃类木脂素2个，二芳基丁烷类3个，其他类型木脂素2个)，黄烷醇类化合物3个，甘油酯类化合物2个，萘醌类化合物1个，黄嘌呤类化合物1个，甾体类化合物2个，其中，5个为新化合物，7个为本科首次报道。

1 Heptane, it was revealed that the Cr〓/ Catsan and ZnCl〓 could catalyze the Michael addition of pyrrole with conjugate olefine at α-position of pyrrole to get mono- or bi-Michael addition product selectively under mild condition in good yield. Totally, forty-six new compounds, including thirty target compounds, were prepared.

在探索7-氮杂桥环母体的构建方法过程中，发现了Cr〓／Clay和ZnCl〓可有效地催化吡咯的α-位与多种共轭烯烃发生Michael加成反应，可在温和的条件下，以良好的收率选择性地得到单或双Michael加成产物。

Thus, in order to attain acetal can be used as precursor of its matrix olefine aldehyde, 2-undecental glycol acetal was synthesized, and the corresponding optimum reaction conditions as: 2-undecental 0.2mol, glycol 0.3mol, cyclohexane as solvent, catalysed by vitamin C, the optium reaction time was 6h, its reaction yield could reach over 77.25%.

为了进一步探求效果更理想的前体化合物，本文继续合成了2-十一烯醛乙二醇缩醛，通过单因素优化实验得到最佳反应条件为：环己烷作溶剂，VC作催化剂，用量0.42%，醛醇物质的量之比0.2：0.3，反应时间6h，此条件下产品收率达77.25%。

Recent developments of clean oxidation systems catalyzed by polyoxometalates are summarized in detail. The emphasis is on the epoxidation reaction of olefinic compounds, oxidation of alkanes and aromatic compounds with the comparatively ideal oxidants, hydrogen peroxide and molecular oxygen respectively.

文本总结了多金属氧酸盐在液相清洁催化氧化方面的进展，主要针对以过氧化氢和分子氧为氧化剂的烯烃类化合物的环氧化反应、烷烃和芳香族化合物的氧化反应，并详细探讨了此类氧化反应的反应机理。

Recent developments of clean oxidation systems catalyzed by polyoxometalates are summarized in detail. The emphasis is on the epoxidation reaction of olefinic compounds, oxidation of alkanes and aromatic compounds with the comparatively ideal oxidants, hydrogen peroxide and molecular oxygen respectively. The oxidation mechanisms are elucidated in detail.

文本总结了多金属氧酸盐在液相清洁催化氧化方面的进展，主要针对以过氧化氢和分子氧为氧化剂的烯烃类化合物的环氧化反应、烷烃和芳香族化合物的氧化反应，并详细探讨了此类氧化反应的反应机理。

The structure of the compound 〓(1) consists of a pentanuclear molecule which is center-symmetric. One W atom is coordinated by four S atoms and two Cu atom. As expected, the Fe atoms are sandwiched between two staggered pentadiene rings. The most interesting aspect of the structure is that Fe-C-P-Cu-P-Cconstitutes a distorted hexagon and Fe-Cu-W-Cu-Fe is nearly in a line.

结构是以W原子为对称中心含有五个金属原子的线型结构，W原子与四个μ〓-S和两个Cu原子配位；Fe原子在两个戊二烯环中间形成一个三明治夹心结构；Fe〓-C〓-P〓-Cu〓-P〓-C〓-构成扭曲的六边形，由于两边1，1'-双二茂铁配体的作用导致Cu-S键的拉长。

The properties of single chain and pauci chain polystyrene microspheres and recent results on the electron microscopy and selected area electron diffraction of single chain monocrystals of polyethylene oxide, isotactic polystyrene, cis1,4 polybutadiene and gutta percha are presented and discussed.

介绍和讨论了单链和寡链聚苯乙烯玻璃体微球的性质以及聚环氧乙烷、同立构聚苯乙烯、－，4－丁二稀、－，4－异戊二烯单链单晶电子显微镜和选区电子衍射观察的最新结果。

The effects of PESA on CaCO3 scale diameter and scale shape were investigated by size distribution measurement and SEM respectively.

以顺丁烯二酸酐为原料一步法合成了聚环氧琥珀酸，并对产物进行了IR和13C NMR表征。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。