丁烯

Condensation of cinnamaldehyde with methyl crotonate in the presence of alcohol-flee potassium methoxide gives,after hydrolysis,p-phenyl-benzoic acid in low yield.Its structure has been ascertained by direct comparison with an au- thentic sample.

桂皮醛与α-丁烯酸甲酯在催化剂去醇的甲氧基钾影响下进行反应，得到低产率的对-苯基-苯甲酸，共结构经用已知方法所得同样的酸直接加以比较而确定。

Good thermal stability, High mechanical strength.Used as catalyst or catalyst carrier in the manufacturing of the important industrial products, such as cyanuramide, benzene anhydride, maleic acid anhydride, butadiene rubber, acrylic nitrite, etc.

用途：本产品在三聚氰胺、苯酐、顺丁烯二酸酐、顺丁橡胶、丙烯腈等重要工业品生产中用作催化剂及催化剂载体，也广泛用于石化产品的精制脱除芳烃，也可用于有机气体、液体的选择性吸附分离及离子交换脱除水中多价有害元素等。

For pre-selection of iron compounds that ferrous sulfate, ferrous chloride, ferrous fumarate, carbonyl iron, amino acid chelated iron, iron asporotate, fenic chloride and ferric pyrophosphate were added in reconstituted skim milk to undergo in vitro digestion, respectively, and then the selected iron compounds were added in reconstituted whole milk to compare the iron bioavailability by estimating dialyzable ferrous iron, dialyzable total iron, nondialyzable and total ferrous iron, respectively.

取硫酸亚铁、反丁烯二酸亚铁、氯化亚铁、艰基铁、Iron asporotate、Amino acid chelated iron、氯化铁与焦磷酸铁等不同铁剂添加於脱脂还原乳中进行体外消化试验，并筛选生物利用性佳之铁剂分别添加於全脂还原乳中，以可透析二价铁、可透析总铁、未透析二价铁及总二价铁等作为评估之指标。

For pre-selection of iron compounds that ferrous sulfate, ferrous chloride, ferrous fumarate, carbonyl iron, amino acid chelated iron, iron asporotate, fenic chloride and ferric pyrophosphate were added in reconstituted skim milk to undergo in vitro digestion, respectively, and then the selected iron compounds were added in reconstituted whole milk to compare the iron bioavailability by estimating dialyzable ferrous iron, dialyzable total iron, nondialyzable and total ferrous iron, respectively.

取硫酸亚铁、反丁烯二酸亚铁、氯化亚铁、艰基铁、Iron asporotate、Amino acid chelated iron、氯化铁与焦磷酸铁等不同铁剂添加於脱脂还原乳中进行体外消化试验，並筛选生物利用性佳之铁剂分别添加於全脂还原乳中，以可透析二价铁、可透析总铁、未透析二价铁及总二价铁等作为评估之指標。

ABSTRACT In this paper, by employing dicarboxylic acids with special conformation, i.

利用几个结构上有特点的二元羧酸，即2，6-吡啶二甲酸、三个异构体苯二甲酸，顺丁烯二酸和4，4'-联苯甲酸作为首要桥基配体，并结合使用含氮中性配。。。

A hyperbranched macromonomer (3) was synthesized with maleic anhydride,diethanolamine,o-phthalic anhydride by step polymerization,take advantage of the different activities of functional groups.

以顺丁烯二酸酐、二乙醇胺、邻苯二甲酸酐等为原料，利用官能团活性的差异，通过逐步展开的方法合成了含有双键和端羟基的聚型分子结构的超支化大单体(3)。

Chapter 1: The reactions of methylenecyclopropanes with phenylsulfenyl chloride or phenylselenyl chloride give cyclobutene derivatives along with ring-opened products in good total yields at 0 °C in various solvents. The reactions of methylenecyclopropanes with diphenyl diselenide give the di-phenylselenyl substituted ring-opening products which can be transformed to 2,5-dihydrofuran derivatives under the oxidation with hydrogen peroxide at room temperature.

在第一章中，我们发现亚甲基环丙烷类化合物在0℃时即可很快与苯硫氯或苯硒氯发生反应生成取代环丁烯类化合物和正常的开环产物；而与二苯基二硒的反应则需加热到150℃以上才能进行反应，生成的二苯硒基开环产物在双氧水氧化下可以转化为取代二氢呋喃类化合物。

Supersonic wave disperse research indicated, ethanediol as the disperse medium, it could got suspending liquid about for firve days, but relatively large in grain size. However, combined use of lauryl sodium sulfate and maleic anhydride as disperse medium, the disperse result among water was better than the former, and it would be steady for two days.

超声分散研究表明，使用聚乙二醇作为分散介质，可得到分散五天左右的悬浮液，但分散后粒度较大，使用十二烷基硫酸钠和顺丁烯二酸酐混合作为分散介质在水中分散效果较好，可稳定两天左右。

There are several methods of industrial production of fumaric acid.

工业上有多种方法生产反丁烯二酸。

The quantity of fumaric acid in Sukebing oral liquid was analyzed with the method of thin layer scan.

采用薄层扫描法对速克痛口服液中反丁烯二酸进行定量分析，平均回收率 96 。

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。