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芳烃化合物

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C〓 thiophene didn't exist in aromatic fraction at 200℃, but very abundant at 300℃, indicating that heterotrophy resulted in the disappearance of chlorophyll which had transformed into more stable compounds with phytane side chain.

在200℃热模拟产物芳烃组份中不存在C〓噻吩,而300℃热解产物中该化合物含量较高,这可能暗示着异养黄化作用导致了叶绿素消失,并转化为更加稳定的具植烷侧链化合物。

As the secondary generation host, CD have received considerable attention because of its particular characterization, and the studies on host-guest interaction based on CD had been transferred from the processes and mechanism of inclusion complex between a pair of host and guest to construction of functional supramolecular aggregates, then these will be useful in the design and preparation of molecular machine and molecular devices, such as molecular pinchers, molecular gears, molecular motors and molecular balances, etc.

它的发展也先后经历了冠醚、环糊精、杯芳烃三代主要的主体化合物,环糊精作为超分子化学的第二代主体化合物以其独特的性质而倍受关注,基于环糊精的主-客体相互作用也在研究单一主体与客体包结形成过程及形成机理的基础上,进而追求具有特定功能的超分子聚集体,为设计制备分子钳、分子齿轮、分子马达、分子秤等重要分子器件和分子机器奠定基础。

Anti-knock additive tetraethyl lead,vapor pressure,cetane number and content of aromatic hydrocarbon,ethylenes,sulfur and oxides respectively in the motor fuel are more detailedly analysed in regard to their effect on motor vehicle exhaust emission.

较为详细地分析了燃油中四乙铅抗爆剂、芳烃含量、烯烃含量、硫含量、蒸气压、十六烷值及含氧化合物等对汽车排放的影响,并简述了其发展趋势。

For the α-arylation of ethyl acetoacetate, the product was α-aryl ethyl acetoacetates, rather than ethyl a-arylacetates which are the major products in other catalytic systems.

较为惰性的氯代芳烃在Pd2/L1的催化下,也能够跟1,3-二羰基化合物发生α-芳基化反应。

In recognition of its important value in ion-selective electrode study, this thesis aims to develop new types of carriers. Metallorganic compounds, Metal-Schiff base complexes, heterocyclic nitrogen compounds, derivatives of calixarene,Sudan Ⅰ and dialkyldithio phosphate have been tested as carriers for all kinds of ions.

鉴于新型载体的开发在离子电极研究中所具有的重要价值,本文主要开展了这方面的一些研究工作,重点考察了金属有机化合物、金属希夫碱配合物、含氮杂环化合物、杯芳烃、苏丹Ⅰ以及双硫代磷酸脂衍生物等各类物质用作离子载体的可能性。

The application results from fluorination showed microwave heating could accelerate chemical reactions markedly. The reaction time could be shortened 50% at least than that of conventional heating. The relationship between fluorinating agents\' structure and their activity was studied systematically. In addition, an anhydrous KF with higher activity was prepared by using expansion effect of microwave heating. As we known, solvents were very important to reaction. The comprehensive study showed some less polar aromatic solvents could be used as dipolar solvents. In addition, they had better effect than dipolar solvents in some occasions, such as fluorination of chlorobenzaldehydes and chlorinated diphenyl ketones etc. The primary applications of ionic liquids were also studied which indicated reactions with ionic liquids as solvents were more efficient and simple.

研究表明,微波是一种节能高效的加热方式,在微波作用下的卤素交换氟化反应具有反应速度快、转化率高、选择性好的优点,其反应时间可较常规加热缩短50%以上;同时也系统地研究了氟化剂种类及制备方式对其反应活性的影响,并利用微波加热的膨化作用制备出了一种活性较高的KF,其活性与喷雾干燥KF相差不大;溶剂对反应具有重要的作用,在此系统地研究了强极性非质子溶剂和中等极性非质子溶剂的应用情况,发现一些中等极性的非质子溶剂如硝基芳烃和氯代芳烃类溶剂在氯代苯甲醛类化合物的氟化反应中具有比强极性非质子溶剂更好的使用效果。

For the α-arylation of ethyl acetoacetate, the product was α-aryl ethyl acetoacetates, rather than ethyl α-arylacetates which are the major products in other catalytic systems.

较为惰性的氯代芳烃在Pd2/L1的催化下,也能够跟1,3-二羰基化合物发生α-芳基化反应。

Among the special nine pollutants, however, eight of them, including Hexachlorobenzene, N-Nitrosodi-N-propylamine, 3,3-dichlorobenzidine, 2,4,6-trichlorophenol, 2,3,4,5,6-pentachlorophenol, indeno (1,2,3-cd) pyrene, 4,4'-DDT and Heptachlor were in need of concern while another chemical: dibenzanthracene be of special concern. The sources of these chemicals were discussed and some control strategies were suggested based on the risk assessment.

结果表明,有18种有机污染物超过了USEPA的标准浓度要求,其中9种物质具有一定的生态风险,其中六氯苯、N-亚硝基二正丙胺、3,3'-二氯联苯胺、2,4,6-三氯酚、五氯酚、茚并(1,2,3-cd)芘、4,4'-滴滴涕、七氯在内的8种化合物具有一定的风险,而多环芳烃二苯并蒽需要引起更高警惕;在此基础上探讨了这些化合物的来源及作用,并提出了相应的防治建议。

The recent research progress of oxidation carbonylation of amines/β-amino alcohols, alkoxycarbonylation of epoxides, carbonylative Suzuki coupling, carbonylative Sonogashira, and double carbonylation of aryl iodides has been presented, focusing on the carbonylation reactions studied by us in the past few years, with 81 references.

综述了胺/氨基醇类化合物氧化羰化、环氧化合物氢酯基化、碘代芳烃的羰化Suzuki偶联、羰化Sonogashira以及双羰基化等重要羰基化反应的研究状况,特别是结合本课题组近年来在该领域中的工作,并对羰基化反应的发展及应用前景进行了展望。

The impure carbon dioxide which can be obtained from any available source of carbon dioxide will typically contain as impurities sulfur compounds such as carbonyl sulfide, hydrogen sulfide, dimethyl sulfide, sulfur dioxide and mercaptans, hydrocarbon impurities such as aldehydes, alcohols, aromatics, propane, ethylene, and other impurities such as water, and carbon monoxide.

可由任何二氧化碳源得到的低纯度二氧化碳通常含有以下杂质:硫化合物,例如硫化羰、硫化氢、二甲硫、二氧化硫和硫醇;烃杂质,例如醛、醇、芳族化合物、丙烷、乙烯;以及其它杂质,例如水和一氧化碳。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。