查询词典 aldehydes

By experiment we found that the reaction of aldehydes and nitromethane can proceed smoothly in the presence of a catalytic amount of Disodium Binaphtholate (3 mol %),and obtain a corresponding rate of product up to 100%.

通过筛选，我们发现在催化剂量的联二萘酚双钠盐(3 mol%)存在下，henry反应能够快速的进行，产率高达100%。

The first part of this dissertation described a new effective method for asymmetric synthesis of,α,α-disubstituted amino acids from the asymmetric Strecker reaction products of aldehydes.

在本论文的第一部分，我们开发了一条以醛为原料，以不对称Strecker反应和不对称烷基化为关键步骤的合成α，α双取代氨基酸的有效方法，并对其立体选择性结果进行了机理探讨。

This protocol could also be used for the selective reduction of the endocyclic double bond of the 3-electron withdrawing group substituted coumarins. This method is clean, mild, and efficient.2 ZrCl_4 / HEH was found to be a selective and efficient reagent combination for the direct reductive amination of electron rich aldehydes and ketones with weakly basic amines after scanning various catalysts such as InCl_3, BiCl_3, CF_3COOH and so on.

图一 1。我们用汉斯酯作为有机还原剂，乙醇为溶剂，实现了4-甲叉基噁嗯唑酮和吡唑酮环外双键的高选择性还原；此外，我们还将这一还原体系用于3-吸电子集团取代-3，4-二氢香豆素环内双键的选择性还原。

To further extend the scope of this type Cannizzaro disproportionation reaction and the reactivity of enolate ligand in complex with aldehyde,we designed to synthesis new rare earth complexes containing arylamido and.enolate mixed ligands,studied their reactivity with aromatic aldehydes for the disproportionation reaction.

为了进一步探索这种歧化反应的应用范围及配合物中作为配体的乙烯醇基与醛的反应性，我们设计合成了含胺基、乙烯醇基混合配体的新型稀土配合物，并研究了其与芳香醛的反应。

The fragrance substances inpumpkins were primary esters, aldehydes, terpenoids and volatile acid et al. The most of flavor substances were easy evaporable.

构成南瓜香气的香味物质成分主要是酯类、醛类、萜类、醇类、酮类及挥发酸等，绝大部分风味物质含量低，又易挥发。

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。

In part Ⅱ, electrophilic substitution reaction of indoles with aldehydes, ketones and 6-Nitro-vinyl catalyzed by dodecylbenzencsulfonic acid in water were studied in detailed.

本文第二部分详细研究了十二烷基苯磺酸水相催化吲哚与醛、酮和硝基烯的反应。

The results indicated that excellent yields of bis(indol-3-yl)methanes were obtained when indoles reacted with aldehydes and cyclo-ketones catalyzed by 20 mol% DBSA in water.

结果表明：在20mol％的DBSA的催化作用下，吲哚与芳香醛、脂肪醛和脂环酮高产率得到相应的双吲哚衍生物。

The result shows that the greater positive influence is from the dissolutions of carotene and browning reaction,next come the cembratriendid compounds and hypoglycemia compounds,while the negative influence is from indoles,toluene and some aldehydes,and the negative influence from...

结果表明，对评吸结果影响较大的是胡萝卜素降解产物类和棕色化反应产物类；类西柏烷类和苯丙氨酸类中性致香物质的贡献较小；负面影响较大的成分主要集中在吲哚、甲苯及一些醛类上，类胡萝卜素降解产物类和棕色化反应产物类中的个别成分也有一定的负面影响。

Thirteen benzimidazole derivatives were synthesized by one-step oxidative cyclisation of 1, 2-phenylenediamine or 4-methyl-1, 2-phenylenediamine at room temperature and a series of aromatic aldehydes under imidazolium salt grafted iodobenzene diacetate assisted.

以水为溶剂，在咪唑盐二醋酸碘苯促进下，通过邻苯二胺或4-甲基邻苯二胺与各种芳醛室温氧化环合，一步合成了13种苯并咪唑类衍生物，反应时间25~45 min，反应产率92%~98%。

You can buy sweetened beverages, if that suits you.

你若喜欢的话，可以买些含有糖精的混合饮料。

As many of you are probably aware, Nick and Vanessa were recently faced with an embarrasing sex scandal after naked pictures of the two getting jiggy with it in a hot tub surfaced the net.

正如很多你可能知道，尼克和 Vanessa 最近面临一个尴尬的绯闻事件后，赤裸裸的图片两个越来越jiggy与它在浴缸中的一个热点浮现净。