丁醛

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%。

The optimum conditions were determined as follows:the molar ratio of butyraldehyde to glycol was 1∶1.6,the mass ratio of catalyst to reactants was 0.4%,the volume of cyclohexane as the water-carrying agent was 10 mL,and the reaction time was 60 min.

结果表明，磷钨钼杂多酸对合成丁醛乙二醇缩醛有较好的催化活性，适宜的反应条件如下：n∶n=1∶1.6、催化剂用量为反应物料总质量的0.4%、带水剂环己烷用量为10 mL、反应时间为60 min。

The condensation reaction,in which the yield of intermediate product after refining process was more than 90%,used iso-butylaldehyde and formaldehyde as materials,Et 3N as catalyst.The hydrogenation,in which the conversion of hydroxypivaldehyde and selectivity of NPG were respectively 99% and 95%,used Cu-ZnO as catalyst,and ethanol as solute,meanwhile in the hydrogenation,the impurity in material could also ...

缩合反应采用异丁醛和甲醛为原料，三乙胺为催化剂，在 60℃左右反应，缩合产物经减压蒸馏和结晶、干燥，得到收率为 90 %以上的中间体羟基戊醛；加氢反应采用自制的Cu -ZnO催化剂，乙醇为溶剂，在 15 0℃将HPA加氢生成新戊二醇，HPA转化率为 99%，新戊二醇收率在 95 %以上，而且HPA缩合反应的副产物在加氢反应中也转化为新戊二醇。

Hydroxybutyraldehyde, which is main material of synthesizing 3-hydroxybutyric acid was prepared through the aldol condensation of acetaldehyde in this paper. The properly reaction conditions of acetaldehyde condensation and paraldehyde depolymerization was studied and obtained.

本文自行制备了氧化反应的主要原料3-羟基丁醛，并对乙醛羟醛缩合反应及三聚乙醛的解聚反应进行了初步研究，确定了反应的最佳条件。

The metabolites were mainly aldehydes and acids when the level of inoculation was 10~9cfu/ml, however, alcohols, acids and esters were produced when the level of inoculation was 10~8cfu/ml. The optimal temperature and pH for production of 3-methyl butanal were 40℃ and 7.0, but NaCl and NaNO_2 inhibited its production.

接种量不同会导致代谢BCAA的产物不同：接种量为10~9 cfu/ml时生成相应的醛和酸；接种量为10~8 cfu/ml时生成相应的醇、酸和酯。S52菌株在40℃，pH 7.0，无亚硝酸盐和NaCl的情况下产3-甲基丁醛的量最多。

The first asymmetric synthesis of trans-β-hydroxy-γ-butyrolactones:-(3R, 4R, 5S)-4-(1-acetoxy-isopropyl)-3-hydroxy-butyrolactone 65a was achieved starting from isobutylaldehyde through nine steps. The key steps involve the construction of three chiral carbon centers by the Sharpless's asymmetric epoxidation and Substrate directable chemical reaction.

以异丁醛为起始原料，经过九步反应首次设计合成了具有三个手性中心的trans-β-羟基-γ-丁内酯：-（3R，4〓，5S）-4-（1-乙酰氧基-异丙基）-3-羟基-丁内酯65a，关键步骤是Sharpless不对称环氧化和底物定向不对称合成反应。

Heptanone was synthesized from n - butyl aldehyde and propanone via cross al-dol condensation, dehydration, catalyzed hydrogenation.

用氧化镁或氧化钙负载氢氧化钠固体碱作缩合催化剂，钯/炭作为加氢催化剂，由丁醛和丙酮经交叉酮醛缩合、脱水、催化加氢制得2-庚酮。

The synthesis of green oxane from isobutyl aldehyde and 2,2,4-trimethy-1,3- pentanediol catalysed by HY zeolite was studied. The effects of ratio of reactants,temperature,solvent,dosage and the recycling of catalyst were investigated.

研究了以异丁醛和2，2，4-三甲基-1，3-戊二醇为原料，HY沸石分子筛为催化剂合成了青叶口恶烷的反应，考察了醛醇比、反应时间、带水剂、催化剂用量与其循环使用性对该反应的影响。

Isobutyraldehyde 1,2-propanediol acetalwas synthesized from isobutyraldehyde and 1,2-propanediol in the presence of aminosulfonic acid as catalyst.

详实地阐述了新型固体超强酸SO2-4/TiO2-MoO3催化剂的制备方法及其应用实例———催化合成异丁醛1，2-丙二醇缩醛新工艺。

In the existing process of PVB, it has disadvantages of unsteady aldehyde groupdistribution, low content of aldehyde acetal group .

本文针对聚乙烯醇缩丁醛传统生产工艺生产的PVB存在缩醛基分布不均，缩醛度低等缺陷，系统地研究了分阶段醇解一缩合的均相工艺，二甲基亚砜的均相工艺以及极性匹配的醇法均相工艺。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。