查询词典 condensation

Starting from 3-benzoyl-5-formyl-indolizine, 3-benzoyl-5-(2'2'-diacetylethenyl)-indolizines and analogs were obtained by the 〓mediated aldol condensation or Wittig reaction. These compounds,promoted by low-valent titanium, gave highly functionlizedcycl[3,2,2]azine derivatives. The coupling reaction proceeded betweenthe carbonyl group and the carbon-carbon double bond, a rare example inMcMurry reaction.

我们以3-苯甲酰基-5-甲酰基中氮茚为原料，通过三碘化钐促进的aldol反应和Wittig反应制备了3-羰基-5-羰基乙烯基中氮茚，随后经低价钛还原偶联，没有生成正常的分子内羰基-羰基偶联产物，而是得到反常的羰基与α，β-不饱羰基的双键偶联产物，较高收率地得到了含多官能团的CycI[3，2，2]azine衍生物。

According to practical experience and study for many years, hot condensation liquid of backset current invite within 2.5-3 hours drawing former solvent of pot all change once, can keep a higher density to the draw pot crude drugs in unit time.

回流的热冷凝液约在2.5-3小时内将提取罐原溶剂全部更换一次，使提取罐内中药材组成中溶质浸出液中的溶质在单位时间能保持一个较高的浓度差，既继承了传统提取罐二次提法的工艺，又节省了50％溶剂投放量。

The author presents for ours this oil painting, color of take the sea - black , deep black, dark blue as the bottom color, has the depth feeling of shadow, by the prominent condensation function, causes the main image bright eye-catching, has one kind of stereoscopic effect; Simultaneously chose the contrast intense white clouds, the snowy peak has come with the sea to face each other across a great distance, the color was bright, has had the striking feeling; Chose the rich vitality green seacoast, the nattierblue hill has made the sea the sideline, has had the gently beautiful feeling; Chose the color variegated light beam to make the sea the central color, the reflection function is intense, the entire picture was bright immediately, the deep color transferred the half tint, has had the lively sprightly feeling; Adds on moon's inverted image, bird's soaring, eagle's convolution, constituted one refinedly to catch fish the chart, also the difficult style which caught fish with the old person has formed the harmonious unification, played the exaggeration role, had achieved the perfect unification, demonstrated the old person just had the suppleness, supple had the just disposition characteristic.

作者呈现给我们的这幅油画，以大海之色――黑魆魆、深黑、深蓝为底色，有深度的阴影之感，以突出聚光作用，使主要形象鲜明夺目，产生一种立体感；同时选择了对比强烈的白云、雪峰来与大海遥遥相对，色彩明亮，产生了醒目感；选择了富有生气的绿色海岸，淡青色的小山做大海的边线，产生了柔美之感；选择了色彩斑斓的光柱做大海的中心色彩，反光作用强烈，整个画面顿时明亮起来，深色转为中间色，产生了活泼明快之感；加上月亮的倒影、鸟儿的飞翔、老鹰的盘旋，构成了一幅脱俗的捕鱼图，也与老人捕鱼的艰难格调形成了和谐的统一，起到了渲染的作用，达到了完美的统一，显示出老人刚中有柔，柔中有刚的性格特征。

Results from the experiment on an EHD experiment bench show that condensation heat transfer in a horizontal tube responds strongly to the EHD technique

在电流体力学强化传热试验台上进行了水平管内凝结传热的强化试验研究，结果表明，EHD技术对水平管内的凝结传热有明显的强化效果

Results from the experiment on an EHD experiment bench show that condensation heat transfer in a horizontal tube responds strongly to the EHD technique; the effect is greater for lower heat flux but lesser for higher heat flux; the enhancement coefficient is proportional to the exerted voltage for a constant heat flux and reaches as high as 156% under the conditions described in this paper.

在电流体力学强化传热试验台上进行了水平管内凝结传热的强化试验研究，结果表明，EHD技术对水平管内的凝结传热有明显的强化效果；低热流密度时，强化效果较好，增大热流密度时，强化效果减弱；热流密度维持不变时，强化系数随强化电压的升高而增大；在本试验条件下，对凝结传热的最大强化系数为 1 5 6%。

Under the basic condition, benzylacetone (1) was prepared by condensation with benzaldehyde and acetone.

以苯甲醛和丙酮为原料，氟化钾氧化铝作催化剂合成了苄叉丙酮。

Benzoin condensation reaction is usually promoted by toxic cyanide ion, so the development of more convenient and efficient synthetic methods, which is environmental benign, is highly desired.

传统上，苯偶姻通过使用剧毒的氰化钠或氰化钾催化安息香缩合反应而得，所以苯偶姻的简单高效和对环境无污染的制备方法很有意义。

Benzoin condensation reaction of benzaldehyde using simple imidazolium based ionic liquids as catalyst has been successfully achieved. The reaction factors such as solvent, base and ionic liquids have been studied in detail.

成功地实现了简单咪唑基离子液体对苯甲醛自缩合成苯偶姻的催化反应，以及详细探讨了溶剂、碱、离子液体种类及用量等各种影响因素。

Benzoin condensation using imidazolium based ionic liquids as solvent for the first time has been successfully achieved. The reaction conditions have been studied in detail. When under 65 and with 0.5 equiv. NaOH in ionic liquid l-butyl-3-methyl-imidazolium tetraborate, benzoin was obtained in excellent yield of 91%. Recycling of ionic liquid has been available.

首次探索并成功实现了在咪唑鎓盐离子液体中进行苯偶姻缩合反应，详细探讨了反应条件，当反应在65℃下和0.5当量NaOH存在下以及在离子液体4-丁基-1-甲基咪唑鎓四氟硼酸盐中进行时，苯偶姻产率可达91％；并对离子液体进行了有效回收再利用。

The compound of 2, 6-Bis (4-aminophenoxy) benzonitrile (26B4APBN) was synthesized through condensation reaction between 4-aminophenol (4AP) and 2, 6-dichlorobenzonitrile.

氨基苯酚和2， 6-二氯苯腈通过缩合反应，合成得到了2， 6-双(4-氨基苯氧基)苯甲腈(26B4APBN)。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。