基本释义:

成环

网络释义

1)redistribution reaction,成环

2)cyclization reaction,成环反应

3)addition-cyclization,加成环化

4)component links,构成环节

5)composition loop,组成环

6)in-situ cyclization,原位成环

用法和例句

Then 4-oxy-7-methyl-1,8-naphththyridine-3-carboxylic acetate was synthesized by cyclization reaction in different heat carr.

在250℃的反应温度下,分别以二苯醚、石蜡油和邻苯二甲酸二乙酯为热载体进行成环反应,得到4-氧-7-甲基-1,8-萘啶-3-羧酸乙酯的收率分别为88。

2-Formyl-3-acetyl-4-methyl-5-carbobenzoxypyrrole(6) was synthesized via the selective oxidation of 2,4-dimethyl-3-acetyl-5-carbobenzoxypyrrole(5),which was produced from acetylacetic benzylester(1) via nitrosation,reduction and addition-cyclization with acetylacetone.

以乙酰乙酸苄酯(1)为原料,经过亚硝化、还原、与乙酰丙酮加成环化生成2,4-二甲基-3-乙酰基-5-苄氧羰基吡咯(5),通过选择性氧化反应制得目标化合物2-甲酰基-3-乙酰基-4-甲基-5-苄氧羰基吡咯(6),反应的总收率约为34%。

The paper analyses the basic issues concerning performance evaluation of national geological work through a theoretical framework involving general concept and classification,main component links and flow,and key points and difficulties.

文章从“国家地质工作的一般概念和分类”、“国家地质工作绩效评价的主要构成环节和流程”和“国家地质工作绩效评价的重点和难点”等三个方面分析了国家地质工作绩效评价的基本问题,并提出了相关建议。

The composition loop dimension and tolerance is calculated and adjusted in order to guarantee products to have qualified dimension.

通过组成环尺寸及公差计算,调整组成环的尺寸公差,以保证产品尺寸合格。

The important reaction mechanism of in-situ cyclization taking place in the course of the expandable copolymer foaming and heat treament was discussed,and then was validated via optical microscope,infrared adsorption spectrum(FTIR) and differential thermal analysis(DSC).

提出MAA/AN/AM三元共聚物在发泡和热处理过程中所发生的“原位成环”反应机理,并通过差示扫描量热(DSC)、热失重(TG/DTG)和红外光谱(FTIR)分析进行验证。

The mechanism of in-situ cyclization during the foaming and heat treatment was studied using differential scanning calorimeter (DSC) and Fourier transform infrared spectrometer (FTIR).

探讨了相应共聚物在发泡和热处理过程中发生的“原位成环”反应及机理,并利用差示扫描量热分析(DSC)和红外光谱(FTIR)进行了验证。

Methacylic acid / acrylonitrile copolymer (MAA/AN) foam with low density,high strength,high rigidity and high heat-resistance is prepared via the means of in-situ cyclization.

通过“原位成环”法制备了一种低密度、高强度、高刚性和高耐热性的(甲基丙烯酸/丙烯腈)共聚物(MAA/AN)泡沫塑料。