芳族

A method to finely separate saturated hydrocarbon and aromatic hydrocarbon by high performance liquid chromatography was introduced.

该文介绍了用高压液相色谱对族组分中的饱和烃、单环芳烃、二环芳烃及三环以上芳烃的精细分离方法。

For copper-treated chloroform extracts the total yield always increases, whereas that of the methanol extracts does not. GC-MS analysis on the fractions from EOM is carried out. No effect on the saturated hydrocarbons is found. For aromatic hydrocarbons copper has no influence on some samples and strong influence on the other.

沥青族组分分析表明，铜的加入对饱和烃在定性和定量两方面基本没有影响；部分样品的芳烃也基本无变化，但另外一些样品的芳烃差别却很大，这些样品加铜后得到的芳烃要比不加铜的在数量上高出几倍。

In this connection, Ar3 and Ar4 independently represent an optionally substituted monovalent aromatic ring.

在这一点上，Ar3和Ar4各自独立地表示任选被取代的一价芳族环。

The value of current density and the apparent active energy of electroreduction of substituted nitrobenzene depend on the electronic effect of substituted group and space resistance. o,m,p-chloronitrobenzene will be electroreduced to azoxy compounds by taking three electrons, o,m-nitrotoulene and o,m-nitrobenzoic acid will be reduced to phenol compounds by taking four electrons, and p-nitrotoulene will be reduced to the aniline by taking six electrons. According to these results, the electroreduction mechanism of the substituted aryl nitro-compounds was studied in detail.

在电还原过程中，还原峰电流和表观活化能的大小均与取代基的电子效应和空间位阻相关，同时取代硝基氯苯得3个电子将还原生成氧化偶氮苯类化合物：邻、间硝基甲苯、硝基苯甲酸得4个电子将还原生成酚类化合物；对硝基甲苯得6个电子将还原生成胺类化合物，在此基础上，探讨了各芳族硝基化合物的电还原机理。

In this paper We mainly studied the catalytic effect of crown ether for Darzens Glycidic Ester Condensation of aromatic aldehydes with ethyl chloroacetate in mixed solvent system .

本文着重研究了在混合溶剂中用冠醚作催化剂所进行的Darzens反应，并合成了四个芳族缩水甘油酸酯类化合物。

The paper mainly studies the catalytic effect of crown ether for Darzens glycidic ester condensation of aromatic aldehydes with ethyl chlorocetate in mixed sovent system.

本文报道了在混合溶剂中冠醚催化作用的 Darzens 酯缩合反应，并合成了四个芳族缩水甘油酸酯类化合物。

Less preferred metal chelating groups are hydroxides amines which may be aliphatic aryl or heteroaryl; or mercaptans which may be aliphatic aryl or heteroaryl.

次选项金属螯合组的氢氧化物胺可能是脂肪族，芳基或杂；或硫醇可能是脂肪族，芳基或杂。

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。

Examples of metal chelating groups include hydroxides especially aryl or heteroaryl hydroxides such as phenolic hydroxides; amines which may be aliphatic aryl or heteroaryl; mercaptans which may be aliphatic aryl or heteroaryl; carboxylic acids which may be aliphatic aryl or heteroaryl; oximes and ketoximines; acetarylamides; hydroxy silanes and silicones; N-containing heterocycles such as imidazoles benzimidazoles triazoles benzotriazoles thiazoles isothiazoles acid anhydrides and more preferably acid groups (especially carboxylic acid groups phosphoric acid groups polyphosphoric acid groups phosphonic acid groups sulphuric acid groups and sulphonic acid groups).

金属螯合组的例子包括氢氧化物，特别是芳基或如酚醛氢氧化物杂氢氧化物；胺可能是脂肪族，芳基或杂；硫醇可能是脂肪族，芳基或杂，这可能是脂肪族，芳基或羧酸杂；肟和ketoximines； acetarylamides；羟基硅烷和有机硅，含N，如咪唑，苯并咪唑类，三唑类，苯并三氮唑，噻唑类，isothiazoles，酸酐杂环，多最好酸组（特别是羧酸团体，磷酸，团体，多聚酸组，膦酸组，硫酸团体和磺酸组）。

The proportion of the phase transfer catalyst and tertiary amine are usually in the range of about 1-5 and about 0.01-5.0 mole percent, respectively, based on total dihydroxyaromatic compound and dicarboxylic acid employed. In the second phosgenation step, the pH is raised to at least 10 and a stoichiometric phosgene excess of at least 5% is introduced.

相转移催化剂和叔胺的比例以二羟基芳族化合物和二羧酸的总量为基础计通常分别在约1―5和0.01―5.0摩尔百分数的范围内，在第二步光气化步骤中，pH值升高到至少约10，并导入超过化学计量约至少5wt％的光气。

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。