烯化

Exxpro specialty elastomers are brominated polymers derived from a copolymer of isobutylene and paramethylstyrene.

Exxpro特种弹性体是一种溴化聚合物，由异丁烯和对甲基苯乙烯共聚物制得。

The result shows that this catalyst has a high catalytic activity and a good selectivity to isomerization of longifolene.

结果表明，该催化剂对长叶烯的异构化反应有很高的催化活性和较好的选择性。

Was used as a catalyst in the isomerization of hexene under in water/organic biphasic system.

本文研究了水溶性配合物[RuCl2]2在水液有机两相对己烯异构化的催化性能。

Furthermore, the mechanism of isomerization between propyne and allene mediated by HCo 〓 has been proposed.

此外，基于反应的自由能曲线，提出了HCo〓催化丙炔和丙二烯异构化反应机理。

The isomerization process of crude isopentene was studied.

对粗异戊烯的异构化工艺进行了研究。

The relationship between acid amount of the catalysts and activity of the isomerization of1- betene was linear.

催化剂的酸度与丁烯-1异构化活性呈线性关系。

The higher selectivity to isopentenes, however, was regarded as a consequence of both insufficient active sites for further hydrogenation of isopentenes to isopentane and lower electronic interaction between Pd and the alumina surface.

而较高的选择性则可归因於没有足够的钯活性中心可供异戊烯进一步氢化生成异戊烷以及钯金属和氧化铝间较低的电子效应所致。

Besides, The reaction of aldehydes with dithioacetate enethiolates followed by alkylation effectively gives α-hydroxyl ketene dithioacetals.

此外，用醛与硫代羧酸硫酯反应再通过烷基化也可以有效地获得α-羟基二硫缩烯酮类化合物。

Keywords ketene;isopropenyl acetate;esterification;strong acidic cation-exchange resin;fine chemical intermediates

乙烯酮；乙酸异丙烯酯；酯化反应；强酸性离子交换树脂；精细化工中间体

In the second chapter, the mechanism of the gold-catalyzed cycloisomerization of bromoallenyl ketone was investigated and discussed.

在第二章中，通过理论计算对金催化的溴代连二烯酮环异构化反应的机理进行了研究和讨论。

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。