烯化

The acylation of 2,3-dimethyl-2-butene by acetic anhydride in the presence of H3PO4 was investigated.

在H3PO4存在下进行了2，3-二甲基-2-丁烯与乙酐的酰化反应。

The side chain of thioacetic acid has been sythesized from the material of acetic acid via four steps, then synthesized the key intermediate of 2-hydroxypenem via displacement, P〓induced cyclization and hydrolyzed reaction from the material of azetidinone.

以羟乙酸为原料，经四步反应合成了侧链化合物硫基取代的羟乙酸，发生取代反应导入到经七步合成的单环氮杂环丁酮中，然后发生酰化，Wittig诱导环化，水解等五步反应合成关键中间体2-羟甲基青霉烯。

Alkylation reactions of thiophenic compounds with olefin contained in FCC naphtha on USY zeolite catalyst were investigated.

以USY分子筛催化FCC汽油中噻吩类硫化物与烯烃的烷基化反应，采用DL-2B-EE微库仑仪测定反应前后硫分布的变化，考察了USY分子筛的制备条件和烷基化反应温度对其催化性能的影响。

Further more, The ZSM-5 zeolite catalyst was modified by molybdenum ion, which possesses bifunctions of aromatizing olefin and removing sulfur in gasoline.

模型烯烃原位反应表明MCM-22上有两类芳构化活性中心，在反应温度分别为190℃和320℃具有芳构化性能，后者是生成芳烃的主要活性中心。

Such changes in thiols by allyl sulfurs may also account for the observed hyperphosphorylation of specific cell cycle proteins and the histone hyperacetylation that has been correlated with suppressed tumor cell proliferation.

这些烯丙基硫化物引起的硫醇的改变同时也可以使特异性细胞周期蛋白过磷酸化及组蛋白过乙酰化，从而抑制肿瘤细胞增殖。

Compared with the present process for the synthesis of acrylate by esterification of acrylic acid, which comes by oxygenation of propylene, the process by the carbonylation of acetylene to acrylic acid and its esters pays less cost, and so, is worth to be studied.

相对于目前主张的丙烯氧化法生产丙烯酸，再酯化生产丙烯酸酯的主流工艺，乙炔羰基化法合成丙烯酸及酯的工艺具有很好的经济性应用价值。

However, no examples of a copper-catalyzed combination of N-alkenylation and N-alkylation of amides had been reported.

然而，组合铜催化的酰胺N—烯基化和N—烷基化偶联生成二氢吡咯衍生物的反应未见文献报道。

The results available now indicate that glass-like carbon synthesized from phenolic resin is a non-graphitizing carbon, and consists of both sp 2-hybridized carbon atoms that form imperfect graphite structure and sp 3-hybridized carbon atoms that are due to the presence of disordered carbon; and in the fullerene-related structure of glass-like carbon, there exist some pentagons and heptagons carbon rings.

玻璃炭作为一种特殊炭材料已广泛应用于许多领域，其制备、性质、应用以及基本结构的研究已经取得了很大的进展，已有的研究结果表明酚醛树脂基玻璃炭是一种典型的非石墨化炭材料，由 sp2杂化态碳原子和 sp3杂态碳原子组成，且在其类富勒烯结构中存在五元环和七元环。

Saponification. Experimental conditions of saponification were optimized by orthogonal test. Under conditions of 60mL of ethanol, 3mL of 600g/L potassium hydroxide solution, 0.5g of absorbic acid, and saponifecation time 45min, the yield of tocotrienols from 5. 0g hull-less barley is the highest.

正交实验结果表明，在本实验条件下从裸大麦（5.0g）中提取生育三烯酚的最佳皂化组合为：无水乙醇60mL、600g/L KOH溶液3mL、抗坏血酸0.5g、皂化时间45min。

UV-curable hyperbranched poly was synthesized via organosilicon polymer bearing silicon hydride end groups and vinyltriallylsilane at the presence of Pt/C catalyst.

通过含硅氢键的超支化聚合物和乙烯基三烯丙基硅烷在铂催化剂作用下反应制备了可紫外光固化的超支化聚硅氧基硅烷。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。