查询词典 acetal

In this paper, a cyclic ketene acetal of 2-methylene-1,3-dioxepane was prepared. And then biodegradable SAP with C-O-C in the backbone was synthesized by Ring-Opening copolymerization of MDO with acrylic acid.

目前市场上使用的高吸水性树脂几乎都是聚丙烯酸类，但其生物分解性差，易造成地下水及土壤环境污染，可生物降解高吸水性树脂的制备引起了学术界极大的关注。

In the synthesis process of ligands and their rare earth complexes, metal lithium is used to substitute for n-butyllithium, such as the synthesis of fluorenyl lithium, piperonal dimethyl acetal lithium, and bis (9-fluorenyl) silylene lithium.

合成配体和配合物的中间体均采用金属锂代替正丁基锂，如芴锂、溴代胡椒醛二甲基缩醛基锂盐、甲基苯基双芴基硅烷双锂盐的制备，方法简单，操作简便，副反应少，且锂盐的浓度和用量易于控制。

Under the protection of purified water-free, oxygen-free argon, using Schlenk technique, the rare rarth organometallic complexes containing piperonal dimethyl acetal and dicyclopentadienyl and involving silylene-bridged fluorenyl have been synthesized.

合成了含胡椒醛二甲基缩醛基和二茂基稀土金属有机配合物。采用Schlenk技术，在干燥纯氩气保护下进行。将溴代胡椒醛二甲基缩醛基锂盐与二茂基一氯稀土（Ln：Yb，Dy，Pr，La，Sm）反应，形成5个新的文献未曾报道的稀土金属有机配合物。

A novel method of deprotection of benzyl and benzylidene acetal groups with K/tBuNH2/tBuOH/THF/18-crown-6 system was discovered and investigated.

四、发现并开发了K/〓BuNH〓/〓BuOH/THF/18-crown-6体系脱苄基和缩苯甲醛的反应，提出了可能的反应机理。

Inaddition, an unexpected synthesis of an α,β,γ,δ-unsaturated ketone due to an abnormalopening of benzylidene acetal by bromide anion was achieved.

另外，在合成BC环的过程中，由于一步反常的溴负离子开苄叉反应，我们还意外地合成了一个α，β，γ，δ-不饱和酮化合物。

Acetic acid ethenyl ester, polymer with ethenol, cyclic acetal with butanal

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Cinnamaldehyde glycol acetal was synthesized using cinnamaldehyde and glycol as raw materials and calcinations of titanium sulphate doped lanthanum oxide as catalyst.

以肉桂醛和乙二醇为原料，搀杂氧化镧的硫酸钛为催化剂，合成了肉桂醛缩乙二醇。

The yield is above 92.7% under the optimum conditions. It showed that titanium sulphate doped lanthanum oxide has higher catalytic activity in the synthesis reaction of cinnamaldehyde glycol acetal and the catalyst can be used repeatedly.

证明搀杂了氧化镧的硫酸钛对肉桂醛缩乙二醇的合成反应具有较高的催化活性，并且催化剂可以重复使用。

Various synthetic methods of the cleavable cyclic acetal-type and ketal-type surfactants were reviewed to provide references for the synthetic route design of these type surfactants and their major research direction in the future were indicated.

综述了可分解型环状缩醛类和缩酮类表面活性剂的各种合成方法，为该类表面活性剂的合成路线设计提供参考，并指明了今后的主要研究方向。

It was found that the more easily systhesized and stable N, N-acetal or N, Ohemiacetal can replace N-tosyl imino ester to react with phenols in the presence of TiCl〓, and α-arylglycine derivatives were also obtained in high yields and high regioselectivity.

进一步研究发现，更易合成的N，N-或N，O-缩醛可以作为亚胺酯的替代物和酚类化合物发生傅克反应。路易酸TiCl〓能有效地促进酚类化合物和亚胺酯的傅克反应较高产率、较高区域选择性的得到2-羟基α-芳香甘氨酸衍生物。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。