1)  asymmetric Diels-Alder reaction
不对称Diels-Alder反应
2)  asymmetric
不对称
1.
Screening of microbe for asymmetric reduction of prochiral aryl ketones and characterization of the reduction reaction;
不对称还原前手性芳香酮微生物的筛选及反应特性
2.
Ethylene polymerization by novel asymmetric dinuclear titanium metallocene complexes;
新型不对称双核茂金属钛催化剂催化乙烯聚合
3.
Analysis of asymmetric running and its protection circuit for triphase asynchronous motor;
三相异步电动机相间功率不对称现象分析及保护电路设计
3)  asymmetry
不对称
1.
Quantitative Description of Anisotropy and Asymmetry by Using Rock Permeability Parameters;
渗透率参数的各向异性和不对称性的定量描述
2.
Facet Joint Asymmetry as a Radiologic Feature of Lumbar Intervertebral Disc Herniation in Children and Adolescents;
小关节不对称—青少年腰椎间盘突出症的放射学特征
3.
Optimal Design for Cross Section of Expressway Based on Asymmetry Development;
基于不对称开发的快速路横断面优化设计
4)  dissymmetric Gemini
不对称Gemini
1.
Progress in dissymmetric Gemini surfactants;
不对称Gemini表面活性剂研究进展
2.
A series of dissymmetric Gemini surfactants with the structure of(C_(12)H_(25)(CH_(3))_(2)N~(+)(CH_(2))_(4)N~(+)(CH_(3))_(2)C_mH_(2m+1)),denoted as C_(12)-4-C_m(m is 14,16,18),have been synthesized with N,N-dimethylalkylamine and 1,4-dibromobutane as the initial reagents.
以N,N-二甲基脂肪胺和1,4-二溴丁烷为原料,合成了一系列具有不同疏水链的不对称Gemini表面活性剂C12H25(CH3)2N+(CH2)4N+(CH3)2CmH2m+1(C12-4-Cm,m=12,14,16,18),并通过1H NMR(核磁共振氢谱)、MS(质谱)和元素分析等方法鉴定其结构。
5)  Unsymmetrical Salen
不对称Salen
6)  dissymmetry
不对称
1.
Due to the structural dislocation between the transmitter and the audience,there exists a semiotic dissymmetry in the advertising text from the surface framework to its deeper logic.
由于传播者与受众之间的结构性错位,从广告文本的表层结构到深层逻辑都存在着符号不对称性。
2.
In the present circumstances of information dissymmetry, the consumption of the consumers must be based on the knowledge of the quality, function and uses of certain products.
本文在分析信息不对称与消费者消费行为关系的基础上,探讨了消费者行为的选择问题。
3.
The paper discusses a reduplication form about structural models,formation condition and its dissymmetry of“lao A ba A de”、“xi A ba A de”and“BA ba A de”in Dongzhi dialect.
本文讨论了安徽东至话中一种形容词重叠形式“老 A 巴 A 的”、“稀 A 巴 A 的”和“BA 巴 A 的”结构形态、成立的条件及其不对称性,并试图从语义的角度解释其不对称的原因和补偿方式。
参考词条
补充资料:Diels-Alder reaction
分子式:
CAS号:

性质: 指含有双键或叁键的不饱和化合物(其侧翼带有羰基或羧基吸电子基团)与链状或环状含共轭双键体系化合物起“1,4-”加成环化反应,生成六元碳环的氢化芳香族化合物的反应。反应一般在无催化剂存在及加压条件下进行,收率较高。但有例外,如丁二烯和乙烯生成环己烯的反应,需加热、加压,收率较低。此反应颇具有理论和实用意义。例如,1,3-丁二烯与马来酸二甲酯通过此反应可合成。1,2,3,4-四氢化邻苯二甲酸二甲酯,某些有机杀虫剂如氯丹等也是通过本反应合成的。

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