查询词典 benzoylation

Zirconia loaded with tungsten oxide has been reported to be an efficient solid catalyst at relatively low temperatures in the skeletal isomerization of alkane or benzoylation of toluene, which are usually catalyzed by strong acids.

中文摘要文献上钨锆氧化物可以在低温的反应条件之下，对於烷类的异构化反应扮演有效的固体酸的角色。然而，钨锆氧化物其本身的比表面积通常只有50 m2/g。

Experimental results show that the incorporation of appropriate amounts of Al~2O~3 into SO~4^2^-/ZrO~2, SO~4^2^-/TiO~2 and SO~4^2^-/Fe~2O~3 is helpful for stabilizing the sulfur species and increasing the effective acid sites on the catalyst surfaces, which can improve the strong acidity and catalytic activity in benzoylation.

实验表明，向SO~4^2^-/ZrO~2，SO~4^2^-/TiO~2和SO~4^2^-/Fe~2O~3中引入适量的Al~2O~3，有助于稳定样品表面的含硫物种，增加样品表面的有效酸位，提高样品的强酸性和对甲苯的苯甲酰化的反应活性。

Microcalorimetric measurements of NH~3 adsorption on catalysts reveal that the remarkable strong acidity and catalytic activity of the Al- promoted catalysts are caused by a change of distribution of acid site strengths and an enhancement in the number of strong and intermediate-strong acid sites effective for the n-butane isomerization and benzoylation of toluene.

NH~3吸附微量热结果表明，Al促进样品的强酸性和催化活性的显著提高是由于样品表面的酸位强度分布发生了变化，有利于正丁烷异构化反应和苯甲酰化反应的中强酸位和强酸位的酸量显著增加。

Experimental results show that the incorporation appropriate amount of Al into SO〓〓/ZrO〓, SO〓〓/TiO〓 and SO〓〓/Fe〓O〓 is helpful to stabilize the sulfur species on catalyst surfaces and to improve the superacidity and catalytic activity for benzoylation of toluene with benzoyl chloride.

实验表明，向SO〓〓/ZrO〓、SO〓〓/TiO〓和SO〓〓/Fe〓O〓中引入适量的Al〓O〓，有助于稳定样品表面的硫物种，提高样品的超强酸性和对甲苯的苯甲酰化反应活性。

The study is to synthesize dual-site phase-transfer catalyst, and use it to form tri-liquid phases, and investigate the catalytic benzoylation of 4'-hydroxyacetophenone sodium salt and benzoyl chloride to produce 4-acetylphenyl benzoate in ultrasound-assisted tri-liquid-phase system.

中文摘要本研究在合成双活性基相间转移触媒，并使用该触媒合成三液相系统，并辅以超音波在三液相系统中催化4-乙醯基酚化钠与氯化苯甲醯形成苯甲酸4-乙醯基苯酯的反应。

With α-D-glucose as raw material, 3-O-benzoyl-1,2,5,6-O-diisopropylidene-α-D-allofuranose was synthesized by isopropylene protection , oxidation, reduction and benzoylation.

以α-D-葡萄糖为原料，经异丙叉基保护、氧化、还原、苯甲酰化反应合成3-苯甲酰基-1，2，5，6-氧-二异丙叉基-α-D-呋喃阿洛糖。

A three-dimensional large pore zeolite Hβ is used in the benzoylation of anisole instead of the classical Lewis acid catalysts to synthesize the important fine chemical intermediate 4-methoxybenzophenone.

采用高硅铝比、热稳定性好的三维大孔Hβ沸石替代传统Lewis酸催化剂催化苯甲醚的苯甲酰化反应，合成了重要精细化工中间体4-甲氧基二苯甲酮，收率可达92%。

The common building block of them was synthesized by firstly glycosylation of an appropriately protected glucose with diosgenin, then introduction of a rhamnosyl residue to the 2-OH at Glu, finally freeing the 4-OH at Glu by selectively benzoylation of 6-OH.

我们先将适当保护的葡萄糖接在薯蓣甙元上，然后选择性地保护葡萄糖的 3 位羟基，在 2 位上引入一个鼠李糖，接下来选择性地保护葡萄糖的 6 位羟基，得到了上面三个皂甙的共同合成子。

The common building block of them was synthesized by firstly glycosylationof an appropriately protected glucose with diosgenin, then introduction of a rhamnosyl residue to the 2-OH at Glu, finally freeing the 4-OH at Glu by selectively benzoylation of 6-OH.

我们先将适当保护的葡萄糖接在薯蓣甙元上，然后选择性地保护葡萄糖的3位羟基，在2位上引入一个鼠李糖，接下来选择性地保护葡萄糖的6位羟基，得到了上面三个皂甙的共同合成子。

The conditions for HPLC to detect endogenous polyamines were optimized, that is, benzoylation for 30min at 37℃, detection wave length at 230nm, elution speed at 0.7ml·min〓 Using the above method, endogenous polyamines of calli in Citrus were analyzed.

优化了植物多胺的HPLC测定条件，确定在37℃苯甲酰化反应30min，检测波长230nm，流速0.7ml·min〓效果最佳。

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。