查询词典 aldehyde acetal

Firstly, phenyliodine diacetate was immobilized to the 2% cross-linked polystyrene or the liner polystyrene resin. The more iodine the resin had, the lower conversion to phenyliodine diacetate. We made our endeavor to extend the range of useful application of polystyrene supported phenyliodine diacetate in organic synthesis:(1) the reagent was used as an effective reagent of carbonyl regeneration from oximes and semicarbazones of ketones.(2) the reagent was also applied to the synthesis of 1, 3, 4-oxadiazoles, 1, 3-disubstituted-2-pyrazoline, 2-arylbenzoxazole from aldehyde N-acylhydrazones, aldehyde hydoazones and phenolic Schiff's bases respectively.

首先，我们以2％交联的聚苯乙烯和线性的聚苯乙烯树脂为载体，制备了聚合物负载的二醋酸碘苯，通过研究发现：(1)聚苯乙烯二醋酸碘苯是酮肟、缩氨脲有效的去保护试剂，不仅芳香酮，脂肪酮和α，β不饱和酮的肟、缩氨脲也能顺利转化为相应的酮，实现酮基的再生；(2)我们还利用此试剂，分别与醛的N-酰基苯、N-酰基苯腙及邻羟基芳亚胺反应，在温和的条件下发生成环反应，以良好的产率生成1，3，4-噁二唑、吡唑啉和二取代苯并噁唑等杂环化合物；(3)聚苯乙烯二醋酸碘苯还可有效地将邻羟基芳酮的酰腙经氧化、重排成1，2-二酰基苯。

Under these conditions,the yield of butyraldehyde glycol acetal was 68.1%.

在此优化条件下，丁醛乙二醇缩醛的收率可达68.1%。

It was found that the products are mixture of Michael-adduct and acetal.

发现在适量甲醇存在时，其超临界反应产物是Michael加成产物和缩醛。

The results showed that the catalyst, with calcium phosphate as the main part, is active and selective in the splitting of acetal.

实验结果表明：以磷酸钙为主体的催化剂对缩醛裂解反应具有较高的活性和选择性。

Sorbitol acetal s is the most one kind of the nucleating agents for polypropylene crystallization.

山梨醇缩醛是最重要的聚丙烯成核剂之一。

One of these, called alcohol dehydrogenase, turns the alcohol molecules into another chemical, acetal dehyde.

其中有一种叫酒精脱氢酶，把酒精分子转化成另一种化学物质，乙醛。

This study did not use formaldehyde, but instead of the xylene—formaldehyde resin as an acetal reagent.

一、前言酚醛树脂是最古老的合成树脂之一，其性能，例如瞬时耐高温性能是其他合成树脂所不及的，因而得到广泛应用。

In this work, a series of poly alcohol acetal derivatives as gelators weresynthesized.

本文合成了一系列多元醇缩醛类化合物，探讨了其结构与凝胶性能的关系，开拓了其在制备纳米材料的实际应用。

It pivots on acetal plastic bushings rotating upon a Stainless Steel surface on the rear top tube .

它支点上缩醛塑料套管旋转后不锈钢表面的后方上管。

In this paper,2,2-dimethylolbutyraldehyde was synthesized through the acetal reaction of formaldehyde and butyraldehyde,using phosphomolybstic acid as catalyst.

研究了磷钼酸对此缩醛反应的催化反应活性，以及催化剂的用量、反应物配比、反应时间等因素对反应产物收率的影响，确定了最佳催化条件。

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。