查询词典 benzaldehyde

Bitter almond contains amygdalin and almond oil, amygdalin can be decomposed to benzaldehyde under acidic condition, benzaldehyde is one of the most widely used flavor in fragrance industry. Almond oil contains high contents of unsaturated fatty acids and VE, it is an advanced edible oil, also can be used in cosmetics materials.

苦杏仁含有2-4%的苦杏仁甙，苦杏仁甙在酶或酸的作用下水解后产生具有强烈的杏仁香气的苯甲醛—即苦杏仁精油的主要成分；另外，苦杏仁含有约50%左右的脂肪油，苦杏仁脂肪油含有大量不饱和脂肪酸以及VE，可直接作为高级食用油或高级化妆品的原料。

The UV-absorption characteristics of benzaldehyde and benzoic acid were discussed, and the quantitative analysis method was developed.

研究了苯甲醛、苯甲酸的紫外吸收特性，建立了同时测定两者含量的方法。

Natural benzaldehyde is a kind of expensive fragrance that is widely used in food, medicine and cosmetics industry.

天然苯甲醛是一种广范应用于食品、医药、化妆品行业的高价香料。

There are many methods of preparing benzaldehyde, but it has been little reported in civil that benzaldehyde is prepared through hydrogenation of benzoic acid.

它的制备方法较多，而用苯甲酸为原料，采用催化加氢还原法文献报道较少。

Benzaldehyde 1, 2-propylene acetalization was carried out with benzaldehyde and 1, 2-propylene alcohol in the presence of polyaniline doped with ferric chloride.

在以苯甲醛和1，2-丙二醇为原料合成苯甲醛1，2-丙二醇缩醛的反应中，探讨了PAn-FeCl3催化剂对缩醛反应的催化活性。

Benzaldehyde 1,2-propylene acetalization was synthesized from benzaldehyde and 1,2-propylene alcohol in the presence of polyaniline doped with copper chloride.

缩醛是一类重要化合物，具有原料来源丰富、生产工艺简单、化学性质稳定等优点，近20年来作为新型香料在日用香精和食品香精中均有广泛应用[1-2]。

The promotion action of ionic liquid as an accelerant in synthesizing benzaldehyde ethanediol acetal and benzaldehyde propanediol acetal was studied.

摘要以离子液体为促进剂，强酸性聚苯乙烯732催化了苯甲醛与两种二元醉的缩醛反应。

Tetra-O-benzyl-D-glucose reacted with bromine to give glucosylbromide. It reacted with hydroxyl phenyl acetonitrile or hydroxyl benzaldehyde to give substituted ph- enylacetonitrile or substituted benzaldehyde.11 New stilbenes were synthesized possessing 2,3,4,6-tetra-O-benzyl-D-glucoside by condensation reaction with pheny lacetonitrile or benzaldehyde, which had potential biological activity and would be sieved in the future.

由2，3，4，6-四芐氧基葡萄糖作为中间体，首先制备出的溴代糖和含有羟基的苯甲醛和苯乙反应制备出含有糖的取代苯甲醛和取代苯乙，再和简单的苯乙或苯甲醛缩合反应生成11种具有潜在的生物活性且含有2，3，4，6-四芐氧基葡萄糖的类化合物，这些新化合物有待于进一步进行药理活性筛选。

First, 4-(2, 3-epoxypropoxyl) benzaldehyde was obtained by reaction of 4-hydroxy benzaldehyde and epichlorohydrin. Then, the Wittig reaction was carried out to convert EBD to styryl glycidyl ether.

首先用对羟基苯甲醛和环氧氯丙烷反应制备4-(2， 3-环氧丙氧基)苯甲醛，然后通过Wittig反应将醛基转化为乙烯基得到含环氧基团的功能性单体苯乙烯基环氧丙基醚，最后用ATRP方法聚合单体SGE得到含环氧侧基的聚苯乙烯。

The degree of hydrogenation of methyl benzoate might be controled by adding the promoters and changing the nano-size of ZnO. For hydrogenation of methyl benzoate to benzaldehyde, the active-structure of a catalyst should be modified to decrease the absorption of benzaldehyde on the surface of it, because benzaldehyde absorbed is hydrogenated easily. Using 30-40％ZnO/γ-Al〓O〓 or Li-30％ZnO/γ-Al〓O〓, a higher selectivity to benzaldehyde is obtained. Hydrogenolysis of methyl benzoate to toluene or benzene is carried out effectively using a catalyst modified. For instance, 45.3％ selectivity to benzene and 100％ conversion of methyl benzoate at 420℃ was obtained over 10％ZnO/MCM-41 with the nano-size particles of ZnO (2.4nm).

也可以通过助催化剂的添加和活性组分的纳米化，并根据苯甲酸甲酯多步加氢反应的特点实行加氢深度的调控：苯甲酸甲酯选择性加氢制苯甲醛中，由于苯甲醛容易进一步加氢，需要对活性结构进行调变，以减弱苯甲醛的吸附，使用30-40％ZnO/γ-Al〓O〓催化剂或Li调变的Li-30％ZnO/γ-Al〓O〓催化剂，可获得较高的苯甲酸甲酯加氢制苯甲醛的活性；采用同样的方式，苯甲酸甲酯选择性氢解为甲苯或苯也获得了较好的结果，如使用ZnO纳米化的10％ZnO/MCM-41催化剂，在420℃，可获得45.3％的苯选择性，苯甲酸甲酯完全转化。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷