丙酮

The reaction of acetone with chlorine gas is a rapid chain reaction.

丙酮与氯气反应制取一氯丙酮，是一个快速的连锁反应。

We found that when acetone was used as solvent, in the presence of TFA, cis-4-pyrrodin-1-yl-L-proline could catalyze the direct asymmetric aldol reaction between acetone and 4-nitrobenzaldehyde with 84% ee.

研究发现，该催化剂以丙酮为溶剂时，加入催化剂等当量的三氟乙酸可以较好的催化丙酮与对硝基苯甲醛之间的直接不对称Aldol反应，得到84%的ee值。

Methods: from prepation of crude drug as start, study the technology of extract and defat with L9 (3~4) orthogonal test. With EtOH extraction and water sed, alkali washing, EtOAC extraction as main methods of eliminate dopant. Finally with alky AlzO3 chromatographic column, rich and gain anticancer active site. The maximum response was achieved at a 40 min extracting time with 10 times volume 90% EtOH added to the sample for the first time and 30 min for the second time. Adding 10 times water will produce precipitation; Place the precipitation into 6 times petroleum benzin to de-fat at 60℃.

云南红豆杉中抗癌活性物制备工艺研究方法：利用正交设计试验L9(3~4)确定原料药提取工艺为：10倍量90％乙醇提取两次，第一次40分钟，第二次30分钟；醇提液用10倍量水沉；沉淀加6倍量石油醚40℃脱脂；用1mol／L的NaOH溶液碱洗，除去酸性杂质；以碱性氧化铝柱，以环己烷／丙酮为洗脱溶剂，在环己烷-丙酮(6：4)段富集到所需活性部位，洗脱剂用量为3VB。

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。

The objective of the present study was to investigate the effect of energy intake during the dry period on the expression of Pyruvate carboxylase and Phosphoenolpyrevate carboxykinase mRNA in the liver of periparturient diary cows.

本研究目的在於观测乾奶期不同能量摄入对围产期健康奶牛肝糖异生关键酶－丙酮酸羧化酶和磷酸烯醇式丙酮酸羧激酶基因表达的影响。

During the data processing, FA is applied to extract the characteristics of secondary variables and eliminate the collinearity among these variables.

针对某丙酮精制过程，提出采用FA 与SVR 相结合的方法建立丙酮产品质量的软测量模型。

objectiveto discuss the anti-tumor effect of 20-ginsenoside rh2 on skin tumor-bearing mice, induced by dmba/croton oil.

方法在脱去毛发的昆明鼠背部涂抹dmba丙酮液以及巴豆油丙酮液，观察动物背部乳头状瘤发生情况，记录荷瘤小鼠数及各鼠荷瘤数。

A new convenient synthesis of a series of 1-aryl-2-propanones using aromatic amines as precursors, via diazo reaction and improved Meerwein arylation reaction under mild conditions, was achieved. In addition, 1-[3,5-bisphenyl]-2-propanone is a new compound among the synthesized compounds. This approach is an efficient synthetic method for the aryl-propanones with the different substituting groups.

以芳香胺为原料，经重氮化和改进的Meerwein芳基取代反应，合成了一系列的1-芳基－2-丙酮，其中1-（3，5-二三氟甲基苯基）2-丙酮是一个新化合物改进后的方法简化了合成步骤，提高了收率，可方便地用于在苯环上具有不同取代基的芳基丙酮的合成。

Experiments show that:when the concentration of acetone is decreased from 100% to 20%,the absorbance bands at 3538cm-1 and 3441cm-1 of CH3 is redshifted,the absorbance band at 1713cm-1 and 1647cm-1 of CO is redshifted about 19 cm-1 and 21cm-1 respectively.

发现随着丙酮水溶液浓度的减小，丙酮CH3键的对称(3538cm-1)和不对称伸缩振动(3441cm-1)吸收峰位置波数减小方向迁徙，CO伸缩振动吸收(1713cm-1)向波数减小方向移动，丙酮浓度为20％时，迁徒至1691cm-1，减小了约19cm-1；同时1647cm-1处的吸收则迁徙至1626cm-1。

Guanine can quench the phthalhydrazidylazoacetylacetone's ECL in acid medium, and the linear concentration range of guanine relative to the ECL intensity is from 2.0×10~(-6) to 1.0×10~(-5) mol/L.The mechanism of phthalhydrazidylazoacetylacetone's ECL on the surface of ITO glass has been discussed according the experimental phenomenon.The phenomenon of ITO self-luminescence has also been studied.It has been found that the machanism of phthalhydrazidylazoacetylacetone on the surface of ITO in different medium is dissimilarity. The phenomenon of ITO self-luminescence may be caused by the interaction of the active oxygen element and ITO's surface.

鸟嘌呤在弱酸性介质中3-(1-乙酰丙酮偶氮)苯二甲酰肼的电化学发光具有显著的淬灭作用，2.0×10~(-6)～1.0×10~(-5) mol/L浓度范围内，电化学发光强度与鸟嘌呤的浓度成良好的线性关系根据相关试验现象对3-(1-乙酰丙酮偶氮)苯二甲酰肼在氧化铟锡玻璃电极上的电化学发光机理进行了初步探讨，并对氧化铟锡玻璃电极自身发光现象进行了研究，研究发现在不同酸度环境中，3-(1-乙酰丙酮偶氮)苯二甲酰肼在氧化铟锡玻璃电极上电化学发光的机理是显著不同的；ITO自身发光可能是由活性氧系分子与ITO镀膜玻璃电极表面相作用引起的。

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。