酸性反应

In this paper, di-isobutyl oxalate was prepared from oxalic acid and isobutyl alcohol using NaHSO_4 and p-toluenesulfonic acid as catalysts.

以草酸和异丁醇为原料，在酸性催化剂作用下进行酯化反应合成出一种新型柴油十六烷值改进剂——草酸二异丁酯。

In the acidic solution,jamesonite is of a salt characteristics,and its electrode process kinetics is controlled by the electrochemical reactions and the adsorption of their productions.

结果表明：在酸性溶液中，脆硫锑铅矿具有盐的特性；电极过程呈现出受电化学反应及产物吸附控制的动力学特征。

This article studies the synthesis of polyoxyethylene lauryl ether using various calcium carboxylates and calcium laurate as catalyst.

研究了以不同的羧酸钙和月桂醇钙为催化剂的月桂醇聚氯乙烯醚A_(12POE的合成，并研究了以上述钙化合物为主催化剂的复合催化剂中一些酸性助催化剂对反应的影响。

In the presence of acid catalyst, APG is formed by use C8 - C14 monohydric alcohols、low-carbon alcohol and glucose monohydrate with one step synthesis reaction, and it could be used without fractionation in most applications.

在酸性催化剂存在下，用C8～C14单羟基醇和低碳醇与一水合葡萄糖反应，一步合成较高纯度，在大多数应用场合不经分馏而直接使用的浅色烷基糖苷。

After cultured for 4 days,the cells were stained with TRAP. Multinucleated(≥ 3 nuclei) TRAP-positive cells were counted as osteoclasts, and the expression of TRAP mRNA were determined by RT-PCR.

2.0？10.0？50.0 ？滋g/ml，对获得的各组破骨细胞行抗酒石酸酸性磷酸酶染色计数阳性破骨细胞(核≥ 3)的数目；提取总RNA用逆转录-聚合酶链反应检测TRAP mRNA的表达？

Both niobic acid and niobium oxide can be used as either catalyst,promoter or support in the heterogeneous catalytic reactions,such as selective oxidation,hydration,hydrolysis,alkylation,dehydrogenation and hydrogenation,because of their acidic and redox properties.

作为一种新型的催化材料，铌酸-氧化铌由于其独特的酸性和氧化还原性正受到越来越多人的关注。它可以作为催化剂的活性组分、助剂或载体使用，在烃类转化、选择性氧化、水解、水合、缩合、加氢脱氢等若干酸碱和氧化还原反应中得到广泛的应用。

In pH=2.0 sulfuric acid solution, 2,2′bipyridine, an almost nonluminescent compound was transformed into a highly fluorescent compound (λex=340 nm,λem=430 nm) when attacked by ·OH generated by Fenton reaction.

在酸性介质中，Fenton反应产生的羟基自由基能将几乎无荧光的2，2′-联吡啶氧化成强荧光物质，羟基化产物的最大激发和发射波长分别是340 nm和430 nm。

Olid super acid of SO_4~(2-)/ZrO_2 and SO_4~(2-)/SnO_2 type have attracted much attention for its strong acidity and good performance in catalyzing organic synthesis reaction, while fewer reports on modification and application of SO_4~(2-)/Fe_2O_3 have been made.

O_4~(2-)／ZrO_2、SO_4~(2-)/SnO_2型固体超强酸因其较强的酸性，在催化有机合成反应中具有较高的活性而备受关注，而关于SO_4~(2-)／Fe_2O_3固体超强酸的改性及应用的报道相对较少。

A simple one-step procedure was described for the synthesis of mesoporous monolith and composite sphere, in which hydrolyzation of tetraethyl orthosilicate and polymerization of urea with formaldehyde occurred at the same time.

利用酸性条件下正硅酸乙酯的水解和脲醛树脂的聚合反应同时一步原位进行的方法合成了二氧化硅复合粉体(包括核壳微球结构和网状结构)和块体凝胶材料。

Deoxybenzoin(3) was prepareded by using the resorcinol and substituted phenylacetic as starting meterials in microwave-mediated.Then the compound(3) was reacted with acetic anhydride to produce(4).The compound(4) was hydrolyzed to convert compound(5) in the acid-mediated. The compound(5) was reacted with the 1,2-dibromo-ethane and 1,3-dibromo-propane in refluxed condition with acetone as solvent to give(6) or(7),respectively.Lastly,the title compounds were synthesized by refluxing(6) or(7) with 2-methyl-benzimidazole and potassium carbonate in acetone solution.

以取代苯乙酸和间苯二酚为起始原料，用微波辐射法合成脱氧安息香(3)，(3)与乙酸酐缩合生成2-甲基-7-乙酰氧基异黄酮(4)，(4)在酸性条件下水解生成相应的异黄酮(5)，化合物(5)分别与1，2-二溴乙烷和1，3-二溴丙烷反应生成(6)和(7)，化合物(6)和(7)再分别与2-甲基苯并咪唑偶合生成目标化合物。

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。