查询词典 aromatic

The present invention relates to the depolymering cyclization reaction of aromatic dithio ether polymer to prepare aromatic cyclic dithio ether compound under the presence of mercapto group containing compound and alkali matter.

本发明涉及利用芳香双硫醚聚合物的解聚成环反应来制备芳香双硫醚环状化合物的方法。该方法采用芳香双硫醚聚合物在含巯基的化合物和碱性物质存在的条件下发生解聚成环反应生成双硫醚环状化合物。

The gasification efficiency increased and the molar fraction of H2 decreased with an increase in the reaction temperature. The decomposition of PVA was more complete at higher temperatures. At 24 MPa, 500℃ and 120 s, the TOC remove rate, the carbon gasification rate and the hydrogen gasification rate were up to 71.46%, 67.97% and 157.24% respectively. A change in the residence time had no significant effect on the molar fraction of gas production but an increase in the residence time could enhance the gasification efficiency of PVA. It was found that the intermediates were mainly alkane, cycloparaffin, aromatic hydrocarbons, and low-molecular weight acids. It was supposed that PVA was degraded into small molecules through breaking of C-C bonds. Parts of the molecules were converted into H2, CO, CH4 and CO2 while some was converted into aromatic hydrocarbons.

过程探索发现：反应温度的升高能提高PVA气化效率，但气体产物中H2的含量随反应温度的升高有所下降；随着反应温度的升高，PVA分解趋于彻底，在压力24MPa、温度500℃、停留时间120s的条件下，TOC去除率、有机碳气化率和氢气化率分别达到71.46%，67.97%和157.24%；停留时间的变化对气体产物含量没有明显的影响，但延长停留时间能提高PVA的气化效率；PVA气化反应中间产物主要为链状烷烃、环烷烃、芳香烃及小分子酸，根据中间产物出现的顺序推测PVA的降解为由C-C键断裂形成小分子物质，这些小分子物质一部分转化为H2，CO，CH4和CO2，一部分形成难降解的芳香族化合物。

A series of diazonium salts of 4-(N-methyl-N-phenylamino)-3-amino-1,8-naphthalic anhydride 5a, its naphthalimide derivative 5b, and 5e were designed and synthesized,and it was the first time to discover that aromatic radical-induced intramolecular aromatic 1, 5-hydrogen transfer was also involved in the nitrogen-contianed system during Pschorr cyclization.

实验设计合成了4--3-氨基-1，8-萘酐的重氮盐5a、其衍生物N-丁基-4--3-氨基-1，8-萘酰亚胺的重氮盐5b和N--4--3-氨基-1，8-萘酰亚胺的重氮盐5c，并首次发现了通过普朔尔环化反应以氮甲基化的氮为桥原子的体系存在着芳香自由基诱导的芳香1，5-氢转移。

Brandy quality could be evaluated through the measurement of pH value, total phenol, colority, catechin, aromatic aldehyde and aromatic acids, Cu content, flavoring compositions, Einstein shift in ultraviolet spectrum, and non-alcohol volatile substances content in Brandy.

可通过测定白兰地的pH、总酚、色调以及儿茶素；芳香醛及芳香酸类物质；紫外光谱的"红移"现象；白兰地中的铜；白兰地中的香气成分；非酒精挥发物总量来评价酒质量。

Reaction Chemistry of Aromatic Compounds - Electrophilic Aromatic Substitution: Halogenation, Nitration, Sulfonylation and Friedel-Crafts Alkylation and Acylation.

芳香化合物的化学反应--亲电芳香取代反应：卤化，硝基化，磺基化和Friedel-Crafts 烷基化和醯基化。

With the single-crystal X-ray studies, the nanoscale rigid cavity of the aromatic macrocycle was approved, and nature of the heteromorphism of aromatic macrocyclic oligomer was also explained with the study of two kinds of single crystal with different steric structures.

并利用单晶X光衍射技术研究了三种不同结构的环状齐聚物的单晶结构，第一次通过大环分子与其对应线性齐聚物键长、键角和二面角的变化解释了聚芳醚酮类刚性大环分子环张力产生的原因。

The molecular charge distribution of the reactivator is affect the reactivating efficacy directly. Moreover its association with hydroximic acid dissociation constant pAa closely, and it will have a great impact on reactivating ability indirectly.(3) There is likely to exist front molecular interaction between Cholinesterase Reactivators and OPC-inhibited AChE, the action sites mainly lie on the aromatic ring, the substitute R and the hydroixic acid group. They act on the aromatic residues of AChE by Π-Π conjugation .(4) The reached results by Comparative Molecular Field Analysis is useful to design new higher efficacy derivatives for 1, 2, 4-oxadiazole class nonquaternary Cholinesterase Reactivators.

2复能剂分子的电荷分布直接影响复活活性，同时对肟酸解离常数pKa具有重要影响，间接影响复活能力；(3)复能剂与磷酰化酶可能存在前线轨道作用，作用部位可能主要在芳香环及其取代基R和肟基上，与AchE的芳香族残基发生л-л电子作用；(4)通过比较分子力场法研究可以指导1，2，4-oxadiazole类非季铵肟胆碱酯酶重活化剂新化合物的合成，可能得到活性更高的复能剂。

Aromatic essential oil can be extracted from about 500-600 kinds of plants,馥诗华 chemists and botanists have selected the most common, safest, most effective and popular 39 aromatic essential oil, among which: orange flower, rose, jasmine, bergamot, lavender, lemon, sandalwood, myrrh, mastic, rosemary, black pepper, cinnamon, clove, Marjoram and chamomile essential oils are outstanding!

有500－600种植物可提炼出芳香精油，馥诗华的化学家、植物学家精选了最常用、最安全的、最见效的、最受欢迎的39种芳香精油，其中：橙花、玫瑰、茉莉、佛手柑、薰衣草、柠檬、檀香、没药、乳香，迷迭香，黑顶胡椒、肉桂、丁香、马郁兰、洋甘菊、十五种精油最为杰出！

A hairy, aromatic perennial herb in the mint family, native to Eurasia and containing an aromatic oil to which cats are strongly attracted.

假荆芥，樟脑草多绒毛的芳香型多年生唇形科草本植物，原产于欧亚，含有十分吸引猫的芳香油

These results suggest that 1O2 formation from the photosensitization of HP results in the oxidation of aromatic amino acids in HSA and the CL is a result of the decay to ground level of excited species generated from the oxidation of aromatic amino acids.

这些实验结果表明，HP光敏化反应产生的单重态氧导致了人血清白蛋白中芳香族氨基酸的氧化，实验探测到的化学发光正是芳香族氨基酸氧化过程中产生的激发态产物返回激发态发出的光子。

The circulation, consumption and reproduction of the trilogy have not only testified to its historical significance and literariness, but also invested it with new meanings.

该三部曲的流通、消费与再生产不仅验证了其历史意义及文学性，而切还赋予它以新的意义。

If he thought that he could buy me off, he would be wrong.

如果他认为他可以收买我，那他就大错特错了。