等环的

The catalytic system composed of NHPI and transition metal ion can catalyze effectively ethane into acetic acid,cyclane into dicarboxylic acid,toluene into benzoic acid,alkene into epoxide,alkyne into acetylenic ketone,and amide into imide;NHPI used alone can catalyze adamantane to be carbonylated,hydrogen peroxide prepared by oxidization alcohol;NHPI combined with as...

NHPI与过渡金属离子组成的催化体系能高效地催化乙烷氧化为乙酸、环烷烃氧化为二元羧酸、甲苯氧化为苯甲酸、烯烃氧化为环氧化物、炔烃氧化为炔酮、酰胺氧化为酰亚胺；NHPI单独使用能催化金刚烷发生氧化羰基化反应、催化氧化醇制取过氧化氢；NHPI与有机助催化剂如偶氮二异丁腈、溴化季铵盐、蒽醌和醇等也能催化分子氧氧化反应。

It is ofreactions of aromatic rings such as acylation, alkylation, etc..

具有芳香性，在环上能进行酰化反应，烷基化反应等芳香环所具有的反应特性。

Wherein X is an oxygen atom or a sulfur atom; C*, C** and C*** are asymmetric carbons; R 1 , R 2 , R 4 , R 5 , R 8 , R 9 and R 10 are each a lower alkyl group optionally having substituent and the like, or R 4 and R 5 and the like in combination optionally form a homocyclic ring optionally having substituent and the like; R 3 is an aryl group optionally having substituent and the like; R 6 and R 7 are each a hydrogen atom and the like; Nu is -CR 16 (COR 17 )(COR 18 ) wherein R 16 , R 17 and R 18 are each a lower alkyl group optionally having substituent and the like, and the like; and EWG is an electron withdrawing group.

通式中，X代表氧或硫；C *、C **和C ***分别表示不对称碳；R 1 、R 2 、R 4 、R 5 、R 8 、R 9 和R 10 分别代表任选取代的低级烷基等，条件是例如R 4 和R 5 可以相互结合形成任选取代的同素环等；R 3 代表任选取代的芳基等；R 6 和R 7 分别代表氢原子等；Nu表示-CR 16 (COR 17 )(COR 18 )(其中R 16 、R 17 和R 18 分别代表任选取代的低级烷基等)等；并且EWG表示吸电子基团。

The α-monobromination of 2-pentone,4-methyl acetophenone,4-methoxyacetophenone,6-methoxy-2-acetylnaphthane,2,2,5,5-tetramethyl-3-hexanone,cyclooctanone,cyclododecanone with respectively,were studied.

研究了离子液体三溴化1-丁基-3-甲基咪唑[Br3]对2-戊酮、4-甲基苯乙酮、4-甲氧基苯乙酮、6-甲氧基-2-乙酰基萘、2，2，5，5-4-甲基-3-己酮、环辛酮、环十二酮、丁醛等羰基化合物的α-溴化反应。

A series of novel amphipathic macrocyclic polyamine ligands derived from iminodiacetic acid and diethylene triamine have been synthesized and characterized by MS, 1H NMR, IR spectra and elemental analysis.

以亚胺基二乙酸和二乙撑三胺为原料，通过关环等反应合成了一类侧链含有羟基的新型两亲性大环多胺。

A motor/ generator cooling system that comprises condenser, liquid separator, lower liquid collecting ring pipe, insulating drainage pipe, stator bar, upper gas collecting ring pipe, balance tube, etc., the components, which is capable of carrying out natural circulation automatically.

以绝缘液体作为冷却介质，由冷凝器、回液管、下集液环管、绝缘引流管、定子线棒、上集汽环管、均压管等部件组成，并能自动实现自然循环的一种电机冷却系统。

Our company is an emerging Carbon Co., Ltd., mainly engaged in all kinds of graphite fixed ring, graphite stationary ring, graphite sleeve, thrust plate, graphite bearing, graphite bearing covers.

我公司是一家新兴的电碳有限公司，主要经营各种石墨动环，石墨静环，石墨套，推力板，石墨轴承，石墨轴承套等。

The main by-product s and their separation and recovery technologies were discussed for cyclohexanone gas-phase Beckmann rearrangement.

探讨环己酮肟气相Beckmann重排主要副产物及其分离回收方法，研究1-氮杂-2-乙氧基-1-环庚烯、1，3，4，5-四氧吖庚因-2-酮及其同分异十句体等副产物回收利用生成已内酰胺的方法。

Rehabilitation of seals is also available in a more unique properties: the injury did not wear face, we have developed a hydraulic reciprocating seal products: grid to circle, Lancaster letters, high-pressure rotating closures, dust-tetrafluoroethane Yixi laps, orientation Support Central, Central-oriented positioning, direction and fluoride with flexible rubber seal; combination of letters: TD, KD, GD, DAS, V-type, and so on.

我们开发的液压往复密封产品有：格来圈、斯特封、高压旋转封、聚四氟乙稀防尘圈、导向支撑环、导向定位环、导向带及氟橡胶密封弹性体；组合封：TD、KD、GD、DAS、V型等。

Based on the changes in the spectrum characters of guest molecules producedthrough inclusion complex formation with cyclodextrins, we have carried out two aspects of investigation:First, the mechanisms for the host-guest recognition reactions have been studied, such as the interactions between 3-CD and curcumin, the main constituent of the rhizomes of the plant Curcuma longa, the recognition of p-CD towards rubidate, the effective component of the Chinese traditional medicine madder, and the reactions of p-CD towards the antileprotic drug dapsone and the antiinflammatory drug nabumetone: The formation of supramolecular complex between P-CD and guest molecule has been discussed and verified in virtue of multitudinous means such asultraviolet-visible absorption, fluorescence emission, infrared spectrogram and so on. The influence of addition of linear alcohols on the supramolecular system has been studied and the reason why the noncovalent interactions in the three-component system could result in a decrease in the apparent association constant of the inclusion complex has been revealed.

本论文基于环糊精对被包结客体光谱性质的改变，开展了两大方面的研究：β-环糊精对姜黄属植物根茎主要成分—姜黄素、中药茜草有效成分—茜草双酯、抗麻风药物氨苯砜及抗炎药物萘丁美酮的主-客体识别反应机制研究：借助超分子包合物的紫外吸收光谱、荧光光谱或红外吸收光谱等手段，通过多种方法探讨并验证了超分子包合物的形成；研究了直链醇的加入对超分子体系的影响，揭示了三元体系中非共价相互作用导致超分子包合物表观结合常数降低的原因：对超分子包结反应进行了热动力学研究，探讨了各热动力学参数的变化趋势并从熵焓互补的角度考察了超分子包结过程；通过荧光猝灭实验进一步揭示了水相中β-环糊精增敏客体荧光的本质原因，从而为超分子化学提供新的理论和研究方法。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。