查询词典 propanone

Their pure products of the six compounds were obtained by silica gel column chromatography and recrystallization in propanone solution.

通过硅胶柱色谱分离和重结晶对所得的六种化合物纯化后获得它们的纯化合物。

Mono(2-hydroxy propyl)phosphate was synthesized from 1, 2-epoxy propane and phosphoric acid in the propanone solvent under the conditions of reaction temperature 30 ℃, reaction time 2 h.

摘 要：以环氧丙烷、磷酸为原料合成了磷酸单( 2-羟基丙基)酯，并以磷酸单(2-羟基丙基)酯和三氧化二锑为原料合成了磷酸单(2-羟基丙基)酯锑。

Ethel ether, propanone and methyl alcohol were used for the separation of sample, BRUKER VECTOR33 FTIR spectrometer was used for test. The infrared spectrums are analyzed, the qualitative and quantitative analyses of the components are shown and the function of every composition is explained.

分别采用乙醚、丙酮、甲醇等有机溶剂对样品进行分离处理，通过BRUKER VECTOR33傅里叶变换红外光谱仪进行测试，对分离后各组份的红外光谱特征进行解析，给出样品的定性和定量分析结果；对各组份在清洗剂产品中的功能进行了分析说明。

With the analysis and discussion of their photoini- liability, it was indicated that their max are all around 330 nm, and all of them have excellent solubility in water and good photoinitiability. Furthermore, the three Photoinitiators with α-tert-amine are obviously superior to the one with just α-sec-amine. Among the four photoinitiators l-(4-aminophenyl)-2-diethylamino-l- propanone dihydrochloride is the best and it has excellent use value.

通过对它们的光引发性能测试和构效关系的分析探讨，表明四种光引发剂的最大吸收波长λ_(max均在330nm左右，具有优异的水溶性和良好的光引发性能，其中具有α-叔胺基团的三种光引发剂明显优于具有α-仲胺基团的光引发剂，尤其以1-(4-氨基苯基)-2-二乙胺基-1-丙酮盐酸盐的光引发性能最好，具有推广应用前景。

Making use of propanone as solvent in this paper,it is decreased by 50% and 60% that SnCl_2 and 35%HCl consumption that the chloromethylenation-SnCl_2/HCl reduction process transform nature vitamin E into α-vitamin E,purification α-vitamin E is easier.

利用丙酮作溶剂，使氯甲基化 SnCl2/HCl还原工艺转化天然维生素E的SnCl2消耗降低了50%、35%盐酸消耗降低了60%，α VE提纯更容易。

In order to obtain the order of reaction between propanone and iodine, colorimeter sensor can be used. The variation of transmittance and absorbance can be fed into the computer. The statistics wizard of the software can perform linear fitting of the data. The order of reaction can then be calculated through the manipulation of the line slope and y-intercept. Download Teachers' Notes

至於研究丙酮与碘的反应级数方面，则可利用比色计感应器，反应时混合物的吸光度和透射比数据均可传送到电脑，利用软件所提供的统计精灵更可以把数据进行图线分析，从所得的直线斜率和Y轴截距等有关资料便可计算出反应级数。

The effect of silicon atom in substrate on the reaction rate and the stereoselectivity of enzymatic reactions was revealed by comparison of horse liver alcohol dehydrogenase-catalyzed stereoselective dehydrogenation of the three isomers of acetyltrimethyl propanone and their carbon analogues in aqueous/organic biphasic systems.

本项目通过对比在水－有机溶剂两相系统中，马肝醇脱氢酶催化三甲基硅烷丙酮的三个异构体及其碳类似物的光学选择性脱氢反应，揭示了底物中的硅原子对酶反应速度、立体选择性的影响规律，成功地合成了高对映体纯度的手性有机硅醇，并实现了辅酶的再生。

TAK-147{- [ 1 --4-piperidinyl ]-1-(1,3,4, 5 - tetrahydro- 1H - 1 - benzazepin - 8 - yl )- 1 - propanone fumarate } has been recently introduced to be another selective AChE inhibitor, which is indicated to selectively inhibit activity of AChE.

这些证据提示了胆碱替代疗法同样可以用于临床VD治疗。近年来，有报道一些胆碱酯酶抑制剂对脑缺血有保护作用，如 HuPerzine A和 ENAJ。

The wall-broken Cole bee pollen lOOg is extracted by 1:10 of anhydrous ethanol , continuously stirred in darkness for two hours. And then by means of centrifuge, cleaning, vacuum concentration, adjusting pH value, anion exchange resin chromatography, propanone extraction,being blown to dry and freeze-dried, we use HPLC to detect the content of the GA derivative of the freeze-dried powder.

将破壁油菜蜂花粉100g，在避光条件下用无水乙醇(料液比1：10)连续搅拌浸提2小时，浸提液经离心、洗涤、真空浓缩、pH值调节、阴阳离子树脂交换、乙酸乙酯萃取、吹干再冻干后用HPLC法分析，得冻干样品中赤霉素衍生物的含量为51.29％。

METHODS Chlorodehydromethyltestosterone was synthesized from methyltestosterone by cycloxidization with hydrogen peroxide to obtain cycloproxene methyltestosterone, which subjected to chloridization with was hydrochloric acid in the presence of propanone to obtain chloromethyltestosterone, and then was subjected to dehydrogenation with DDQ using PTS as dehydrogenation catalyst in benzene.

以甲睾酮和H2O2环氧化反应得到环氧甲睾酮，再与盐酸在丙酮溶媒中进行氯化反应，得到氯甲睾酮，最后用2，3-二氯－5，6-二氰基对苯醌在PTS催化下脱氢得到脱氢氯甲睾酮。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了