查询词典 isobutyraldehyde

In this work, isobutyl isobutyrate was prepared by the condensation of two molecular isobutyraldehyde in the presence of aluminium isobutoxide catalyst system.

依据间歇反应所得一系列数据，确定了异丁醛连续缩合反应工艺流程；考察了以异丁醛为原料，在 5～10℃，停留时间 1 5～ 2h ，在异丁氧基铝催化体系作用下，两分子异丁醛缩合成一分子异丁酸异丁酯；脱除催化剂后，粗产品精制得到纯度≥ 99 5 %的异丁酸异丁酯，异丁醛的转化率≥ 98 5 %，异丁酸异丁酯的选择性≥95 %。

It is found that UIFR with softening point of 90℃, OH value of 32mg KOH/g andM of 377 g/mol is synthesized when molar ratio of isobutyraldehyde to formaldehyde is 1.5, molar ratio of aldehyde to urea is 6, vacuum distillation temperature and time is 140℃ and 1 h respectively. The terpolycondensate is soluble in most solvents, of paints and exhibits excellent yellowing-resistance.

结果表明，在异丁醛、甲醛摩尔比为1.5，醛、脲摩尔比为6，真空蒸馏温度为140℃、时间为1h的条件下，合成出的UIFR软化点为90℃，羟基值为32mgKOH/g，M为377g/mol，且树脂具有良好的溶解性和杭黄变性。

The PA-c DSPI ink is alcohol-soluble inks for polyethylene antishrinking isobutyraldehyde resin that can be used for gravure printing, flexo printing can also be used.

DSPI的PA—C油不朱是醇溶性油不朱，拆开料为聚乙烯伸丁醛树脂，可用于瘪印，也可用于柔印。

At present, the main operators of chemical species have: propionaldehyde, n-butanol, isobutanol, octanol, isobutyraldehyde, acrylic esters, such as n-butyraldehyde .

目前主要经营的化学品种有：丙醛，正丁醇，异丁醇，辛醇，异丁醛，丙烯酸酯，正丁醛等。

By reacting isobutyraldehyde with diethyl oxalate using sodium methoxide as catalyst,3-methyl-2-oxobutanoic acid,sodium salt was prepared by one pot.

采用甲醇钠催化异丁醛与草酸二乙酯反应，一釜法合成了3-甲基-2-氧代丁酸钠。

By reacting isobutyraldehyde with diethyl oxalate using sodium methoxide as catalyst,3-methyl-2-oxobutanoic acid,sodium salt was prepared by one pot.

3-甲基-2-氧代丁酸钠是一种重要的酮酸类化合物，它在制药工业、高分子工业、食品工业、日化业等领域都有着广泛的用途。

The oxido-reduction and reduction-reoxidation specificity of heteropolyacid salts containing various kinds of alkali metals used for one-step oxidition of isobutyraldehyde to produce methacrolic acid was studied by ESR method.

用ESR法研究了异丁醛一步氧化制甲基丙烯酸过程中所用杂多酸盐催化剂的氧化－还原特性。

Oxidation of alkenes catalyzed by metalloporphyrin imidazolium salts in the presence of N-hydroxyphthalimide and isobutyraldehyde as co-catalysts provided the epoxidation product at room temperature. And the solvent with a weak coordinating ability such as acetonitrile gave the best result.

金属紫质咪唑盐於烯类的氧化催化反应上，若与NHPI及异丁醛共催化，可在室温进行环氧化反应，反应溶剂选择具有弱配位能力的乙腈，则可获得较佳结果。

The novel title compound was synthesized with benzaldehyde, isobutyraldehyde, phosphorus trichloride as raw materials. The total yield was 40.8%. The structure was confirmed by 1H NMR, 31P NMR and elemental analysis.

摘要以苯甲醛、异丁醛、三氯化磷为原料合成了新型的1，3，2-氧磷杂环类化合物2-苯羟甲基－5，5-二甲基－4-苯基－2-氧代－1，3，2-二氧磷杂环己烷，总收率为40.8%，并对其进行了NMR研究和结构表征。

Ab initio and density functional theory (B3LYP) in G98 were employed to study the following four direct aldol reactions between acetone and isobutyraldehyde or 3,3-dimethylbutyric aldehyde or benzaldehyde or 4-bromo-phenyl aldehyde catalyzed by-proline .

中文摘要：本文采用G98程序包中的从头计算方法和密度泛函方法计算研究了-脯氨酸催化丙酮与异丁醛、3，3-二甲基丁醛、苯甲醛及对溴苯甲醛的不对称直接羟醛缩合反应，共计四个反应体系。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。