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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。

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

通过实验研究了硅钨酸对此羟醛缩合反应的催化效果，研究探讨了硅钨酸对此缩醛反应的催化反应活性，以及催化剂的的用量，反应物配比，反应时间等因素对反应产品收率的影响，确定了最佳催化条件。

Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.

缩醛类化合物是近几年发展起来的高档新型香料，在日用香精和食品香精中有广泛应用。

The effects of mole ratio of reactants,reaction time and catalyst dosage on the yield of n-octylaldehyde 1,2-propylene glycol acetal were examined.

考察了醛醇摩尔比、反应时间、催化剂用量及其重复使用等因素对反应的影响，优化了反应条件。

The experimental results showed that SO_4 2-/TiO_2-MoO_3 was an excellent catalyst for synthesizing isobutyraldehyde glycol acetal .

研究了以固体超强酸SO42-/TiO2-MoO3为催化剂，异丁醛和乙二醇为原料，合成异丁醛乙二醇缩醛的反应条件。

Selectivity of acetal was obtained over the Cu/HY-25 catalyst at the temperature of 413K.

通过铜盐与酸功能组分的匹配，以醋酸铜和HY-25分子筛制备的催化剂，在413K生成乙缩醛的选择性大于80％。

TiSiW_(12)O_(40)/TiO_2 is an excellent catalyst for synthesizing butyraldehyde 1,2-propanediol acetal and the yield could be up to.

报道了以TiSiW_(12)O_(40)/TiO_2为多相催化剂，通过丁醛和1，2-丙二醇反应合成丁醛缩1，2-丙二醇。

The traditional catalyst used in acetal synthetic reaction is strong inorganic acid.

文摘：缩醛合成反应的传统催化剂为无机强酸，但由于副反应多、腐蚀性强和易污染环境等缺点，其使用受到限制。

Using self-made H3PW6Mo6O40 as catalyst,butyraldehyde glycol acetal was prepared by butyraldehyde and glycol.

用自制的磷钨钼杂多酸作催化剂，以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.

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。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。