查询词典 alkenes

This paper expounds the photochemical reaction of alkenes, ketones and aromatic hydrocarbon, and discusses the mechanism of their photochemical decomposition and the application of photochemistry in organic synthesis.

本文介绍了烯、酮、芳烃体系的光化学反应，从光化学过程讨论了它们的光解机理以及它们在有机合成中的应用。

Looked closely at microscale experiment and introduced how to use butane blowlamp as a heat source to carry out high temperature microscale experiment by the sample of cracking alkenes.

进一步审视了微型实验，并以烷烃裂化实验为代表，介绍了如何将丁烷喷灯作为热源进行高温微型实验。

At lower temperature, GOC process of decane is more suitable for producing liquid compounds, as well as low alkenes.

于热裂解反应相比，低温下正癸烷的GOC反应更适合制备液体组分，同时联产低碳烯烃。

Furthermore, we also studied the coupling reaction of alkenes with alkynes initiated by carbopalladation catalyzed by divalent palladium.

另外我们还对炔烃碳钯化启动的烯炔偶联反应进行了初步的探索。

We have studied the transition metal complexes catalyzed sequential cross coupling reactions of these new difunctional group reagents with electrophiles and nucleophiles, respectively; developed some convenient and practical new methods for the stereoselective synthesis of disubstituted alkenes, trisubstituted alkenes, conjugated dienes containing heteroatom, conjugated enyne containing heteroatom etc., enriching methodologies for organic synthesis.

继而研究了这些新型双官能试剂在过渡金属配合物催化下分别与亲电试剂、亲核试剂的顺序交叉偶联反应，为双取代烯烃、三取代烯烃、杂原子取代的共轭二烯烃、杂原子取代的共轭烯炔烃等的立体选择合成提供了方便实用的新方法，丰富了烯烃立体选择合成的方法学。

In addition, a benzene, toluene (0.32%), was also detected in 80% ripening fruit. In 90% ripening fruit were detected 27 kinds of aroma components belonging to 2 categories. Among the components, 17 were esters, and 10 alkenes. Of the 17 esters, methyl octanoate is the highest (21.00%), followed by ethyl hexanoate (17.64%), methyl hexanoate (14.34%). Of the 10 alkenes cis-β-ocimene is the highest (1.00%), followed by à-copaene (0.81%) and trans-ocimene (0.48%).

在9成熟果实中检测到2类共27种香气成分，分别是酯类17种和烯类10种；在酯类中，相对含量最高的是辛酸甲酯(25.27%)，其次是辛酸乙酯(21.00%)、己酸乙酯(17.64%)、己酸甲酯(14.34%)；在烯类中相对含量较高的有β-顺式－罗勒烯(1.00%)、à-蒎烯(0.81%)和反式－罗勒烯(0.48%)。

Photoinduced Electron Transfer [2+2] Cycloaddition Reactions ofBenzannelated Isoquinolin-1-ones with Electron Deficient Alkenes Photoinduced [2+2] cycloaddition reactions of 11H-benzoxazolo[3,2-b]isoquinolin-11-one 8 and 11H-benzothiazolo[3,2-b]isoquinolin-11-one 13 with electron deficient alkenessuch as acrylonitrile, methyl acrylate, dimethyl fumarate and dimethyl maleate afforded a group of polycyclic isoquinoline derivatives bearing cyclobutane moieties ingood to excellent yields and resulted in the Schenck isomerization of the alkenes.

3苯并增环异喹啉-1-酮与缺电子烯烃的光诱导电子转移[2+2]环加成反应 11H-苯并恶唑[3，2-b]异喹啉-11-酮8和11H-苯并噻唑[3，2-b]异喹啉-11-酮13与缺电子烯烃如丙烯腈，丙烯酸甲酯，富马酸二甲酯及马来酸二甲酯的光诱导[2+2]环加成反应以高产率给出一系列含有环丁烷结构单元的多环异喹啉衍生物并导致烯烃的Schenck异构化作用。

Methodologies for stereoselective synthesis of alkenes are of great interest in synthetic organic chemistry since many biologically active compounds occuring in nature possess the structural skeleton of disubstituted or trisubstituted alkenes.

烯烃的立体选择合成方法学研究是有机合成化学中的重要课题，因为许多重要的天然产物中均含有双取代或三取代烯烃的结构单元。

As an essential component of the Baylis-Hillman, alkenes especially activated alkenes are a kind of very important building blocks in organic synthesis, and have been applied in various fields.

作为Baylis-Hillman反应的重要组成部分，烯烃特别是具有一定活性的烯类化合物，由于它们本身的结构特征，具有与一般烯烃不同的独特的性质，是非常重要的有机合成中间体。

The result implied that C-H wagging out-of-plane vibration was most important in classifying alkenes are cycloalkenes or chain alkenes.

实验结果表明，烯烃的C-H面外弯曲振动是分类烯烃是环烯烃或链烯烃的最重要的片段光谱。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新