缩醛

以单质碘为催化剂，通过丁醛和乙二醇反应合成了丁醛乙二醇缩醛。

Butyraldehyde glycol acetal was synthesized from butyraldehyde and glycol by using iodine as catalyst .

方法以4羟基6甲基2吡喃酮、N，N二甲基甲酰胺二甲氧基缩醛为起始原料，经两步反应制得目标化合物。

Methods The target compound was synthesized by two steps with 4-hydroxy-6-methyl-2-pyrone and N , N-dimethylformamide dimethyl acetal as the starting materials .

N，N-二甲基甲酰胺二甲基缩醛的制备

Preparation of N , N-dimethylformamide dimethyl acetal

含手性轴的季戊四醇双缩醛的NMR研究

An NMR Study on Pentaerythritol Diacetals with Chiral Axes

用聚乙烯醇（PVA）缩醛化方法，共价键结合肝素。

Acetalized poly ( vinyl alcohol )( PVA ) graftes heparin by covalent bond .

本文研究了回收季戊四醇溶液或季戊四醇母液加压水解时pH值、压力和时间等因素对缩醛水解的影响。

The factors such as pH value , pressure and time in pressurized hydrolysis of pentaerythrite solution and pentaerythrite mother liquor are studied .

双半缩醛交联剂BHA在织物整理中的应用

Application of bi - hemiacetal crosslinking agent BHA in fabric finishing

后期改性是通过PVA上醇羟基的缩醛化酯化、醚化等化学反应以及Michael加成反应等实现。

The post-modification was accomplished by acetalization , esterification and etherification of hydroxyl group of PVA as well as Michael addition reaction .

HY分子筛催化合成新型七员环缩醛（酮）的研究

Synthesis of Novel Seven - member - ring Acetals and Ketals Catalyzed by HY

MCM-41分子筛负载磷钨酸催化合成苯乙醛乙二醇缩醛

Synthesis of Phenylacetaldehyde Ethylene Glycol Acetal by Phosphotungstic Acid Supported on MCM-41 Molecular Sieve as Catalyst

MoO3/SiO2固体酸催化合成苯甲醛甘油缩醛

Synthesis of Benzaldehyde Glycerol Acetals Catalyzed by MoO_3 / SiO_2 Solid Acid

以及在聚乙烯醇中加入交联剂戊二醛（GA），交联改性后，缩醛膜的阻气性能与所加交联剂戊二醛的量的关系；

And the relationship between gas-barrier properties of cross & linked film and GA content in PVA also was studied , after adding GA into PVA .

用BunteSalts法合成正丁醛二正丁硫醇缩醛的研究

Study on Bunte Salts Synthesis of Butyl Aldehyde Dibutyl Mercaptal

TiO2/SO4~（2-）催化季戊四醇双缩醛或双缩酮的合成

Synthesis of Diacetals from Aldehydes and Ketones with Pentaerythritol Catalysed by TiO_2 / SO_4 ~ ( 2 - ) Solid Superacid

FeCl3-漆酚树脂催化合成酯、缩醛和缩酮的研究

Fecl_3 urushiol resin catalyzed synthesis of ester , acetal and ketals

测定凝胶化的PVF缩醛度的新溶剂体系

A new solvent system used to determine the degree of acetals of PVF

通过对该合聚物的IR和NMR谱图分析，得知该聚合物含有酯基和酮基的结构单元，以及环缩醛的侧链。

The IR and NMR spectra of the polymers indicated that the polymer structure contained ester and ketone units in the backbone , and a cyclic acetals as side chain .

降解前后的FT-IR分析表明，在降解过程中缩醛产物的主链发生了断裂。

FT-IR analysis of the samples before and after biodegradation indicated that fission occurs in the backbone of PVA acetals during the degrading process .

采用有机溶剂提取总磷脂，高效薄层层析分离PC和PE，进一步用不同展开体系分离纯化非缩醛磷脂和缩醛磷脂。

The total phospholipids were extracted and PC , PE were separated as above , non - plasmalogens and plasmalogens were separated and purified by the method of HPTLC with different developing system .

并对低取代度（DS）淀粉醋酸酯制得的白乳胶进行了初步的缩醛化改性试验。

And a primary acetalization modification test has been done for the white glue made with the low degree of substitution ( DS ) starch acetate .

将维生素C作为催化剂用于缩醛和缩酮的合成中，由乙二醇或1,2-丙二醇与醛或酮中的羰基反应生成缩醛或缩酮。

The catalyst of vitamin C was first used in the synthesis of acetals and ketals . Glycol or 1,2-propanediol reacted with the carbonyl group of aldehydes or ketones in the presence of vitamin C to yield acetals or ketals .

结果表明，PVA缩醛化产物的降解性均明显低于未改性PVA的降解性，并随着缩醛度或交联度的增加而下降。

The results revealed that the biodegradability of PVA acetals is inferior to that of the unmodified PVA , and declines as the acetalizing or cross-linking degree increases .

由于缩醛化反应不能完全进行，PVB大分子链上含有一定量的羟基。

PVB molecular chain usually contains hydroxyl groups as a result of a not fully complete acetalization reaction .

使用尿素和三聚氰胺对PVA缩甲醛胶进行改性，可大大降低缩醛胶中游离醛的含量，提高成膜物的耐水性，降低成本。

To modify polyvinyl Formal gel with urea and melamine can greatly reduce free formal content in the gel , improve water resistance of film forming substance and lower the cost .

AlPO4催化剂的制备和表征及其在缩醛化反应中的催化性能

Preparation and Characterization of AlPO_4 Catalyst and Its Application in Acetalization

我们分别用苯和N，N-二甲基甲酰胺（DMF）作为溶剂，比较了六种双缩醛（酮）在两相和单相溶液中的合成。

We use benzene and N , N-dimethylformamide ( DMF ) as the solvent separately , comparing the synthesis of six pairs of diacetals ( diketals ) in two phases and single phase solution .

以MCM-41负载磷钨酸作催化剂，对以苯乙醛和乙二醇为原料合成苯乙醛乙二醇缩醛的反应条件进行了研究。

Phenylacetaldehyde ethylene glycol acetal was synthesized with phenylacetaldehyde and ethylene glycol as raw materials in the presence of phosphotungstic acid supported on MCM-41 molecular sieve .

苯乙醛和乙二醇以NaHSO4·H2O为催化剂，在无有机溶剂和无机载体的条件下经微波辐射直接催化合成苯乙醛乙二醇缩醛。

Phenylacetaldehyde ethyleneglycol acetal was directly synthesized by reaction of phenylacetaldehyde and ethyleneglycol under microwave irradiation catalyzed by NaHSO_4 · H_2O without any organic solvent and inorganic carrier .

聚乙烯醇（PVA）在乙醇水溶液中在酸性条件下与醛类缩醛化制成PVA缩醛的乙醇水溶液。

After degraded by oxidation process , polyvinyl acetals , prepared from acetalation of PVA with aldehydes in aq . alcohol solution under acid conditions , can be directly used for adhesive and coating .

水溶性聚乙烯醇缩乙二醛胶粘剂的制备MCM-41分子筛负载磷钨酸催化合成苯乙醛乙二醇缩醛

Preparation of Water Soluble Polyacetal by Condensation of Polyvinyl Alcohol with Glyoxal Synthesis of Phenylacetaldehyde Ethylene Glycol Acetal by Phosphotungstic Acid Supported on MCM-41 Molecular Sieve as Catalyst