丙酮

While the adsorptions of 1-propanol and 1-Br-propane at 100℃ give rise to 1-propoxy species, which mainly converted to propanal at higher temperature. IR spectrum arising from the interaction of propene with the catalyst at 100 ℃ shows the IR bands of allyl alcoholate and isopropoxy species. As the temperature was increased to 150℃, the bands ascribable to the adsorbed acetone and acrolein were observed. Based on these results, it is suggested that isopropoxy species is one of the intermediates for SOP to acrolein over MoPO/SiO〓 catalyst.

2原位IR光谱实验结果表明：200℃时丙烷/O〓混合气在催化剂表面吸附后的IR谱与同温度下异丙醇吸附的IR谱相似，均检测到吸附态丙酮物种和丙烯醛物种的IR谱峰；溴代异丙烷和异丙醇在催化剂表面吸附后均转化为异丙氧基，异丙氧基主要转化为丙烯和丙酮，丙烯进一步转化为丙烯醛；溴代正丙烷和正丙醇在催化剂表面吸附后均转化为正丙氧基，正丙氧基主要转化为丙醛；丙烯在催化剂表面吸附后转化为σ-氧烯丙基和异丙氧基，升温后σ-氧烯丙基转化为丙烯醛而异丙氧基转化为丙酮。

While the adsorptions of l-propanol and 1-Br-propane at 100 癈 give rise to 1-propoxy species, which mainly converted to propanal at higher temperature. IR spectrum arising from the interaction of propene with the catalyst at 100 癈 shows the IR bands of allyl alcoholate and isopropoxy species. As the temperature was increased to 150 癈, the bands ascribable to the adsorbed acetone and acrolein were observed. Based on these results, it is suggested that isopropoxy species is one of the intermediates for SOP to acrolein over MoPO/SiO2 catalyst.

原位IR光谱实验结果表明：200℃时丙烷／O_2混合气在催化剂表面吸附后的IR谱与同温度下异丙醇吸附的IR谱相似，均检测到吸附态丙酮物种和丙烯醛物种的IR谱峰；溴代异丙烷和异丙醇在催化剂表面吸附后均转化为异丙氧基，异丙氧基主要转化为丙烯和丙酮，丙烯进一步转化为丙烯醛；溴代正丙烷和正丙醇在催化剂表面吸附后均转化为正丙氧基，正丙氧基主要转化为丙醛；丙烯在催化剂表面吸附后转化为σ-氧烯丙基和异丙氧基，升温后σ-氧烯丙基转化为丙烯醛而异丙氧基转化为丙酮。

The catalysts used in the preparation of di acetone alcohol by the Aldol condensation were studied in detail, and a new kind of catalyst Ca 2/Al 2O 3 is developed.

对丙酮经Aldol缩合制二丙酮醇的催化剂进行了研究，研制出新型催化剂Ca 2 /Al2 O3，这种催化剂对丙酮的缩合反应具有较理想的活性及选择性。

The spinning solution is made by dissolving cellulose acetate in acetone containing a small amount of water (up to 10 percent).

将醋酯纤维素溶解于丙酮中(丙酮中含有少量的水，最大含水量为丙酮重量的10%)而形成纺丝液。

Acetone has been in common use as a solvent and as an extracting regent, in industry for several decades. It is easy to evaporate in air. When the concentration of acetone in air is higher than 10,000 ppm, people may experience such symptoms as cephalalgia, nausea and so on.

由於丙酮是工业上广泛应用的溶剂，它极易挥发，且当人体曝露在高浓度的丙酮下，会有头痛、困倦及呕吐等症状，所以丙酮感测器可应用於工业的环境检测。

The simulation results show that the free energy of hydrogenation of acetylacetone iron to prepare enol-acetylacetone is less than that of the reaction to produce keto-acetylacetone at the same temperature.

计算结果表明：相同温度下，乙酰丙酮铁加氢生成烯醇式乙酰丙酮的反应自由能小于生成酮式结构乙酰丙酮的反应自由能；乙酰丙酮铁加氢更倾向于生成烯醇式结构的产物。

Pyruvaldehyde was synthesized with acetone or 1,2 propanediol as starting material respectively.With n∶n=1 00∶0 79,3 0-4 0 g potassium chlorate as catalyst,and water and glacial acetic acid as solvent,refluxing on water bath of 60-75 ℃ for 4 h,bromoacetone was obtained in 63 5% yield.

分别用丙酮和 1，2 丙二醇做原料合成了丙酮醛。n∶n =1 0 0∶0 79，加入 3 0～4 0g氯酸钾做催化剂，水和冰醋酸做溶剂，水浴温度为 6 0～ 75℃，回流 4h ，制得产率为 6 3 5 %的溴丙酮。V∶V =11 9∶1 0 ，通入空气，在 6 5～ 70℃反应 5～ 8h ，制得产率为 5 9 6 %的丙酮醛。

In this paper four watery UV photoinitiators were studied and synthesized through a four-step process. They were l-(4-aminophenyl)-2-piperidino-1-propanone dihydrochloride, 1 -(4-aminophenyl)-2-morpholino-1 -propanone dihydrochloride, 1 -(4-aminophenyl)-2-diethylamino-1 -propanone dihydrochloride, 1 -(4-aminophenyl)-2-burylamino-1-propanone dihydrochloride, which have not been reported in any literatures till now.

本文通过四步反应合成了目前未见报道的四种水性紫外光引发剂：1-(4-氨基苯基)-2-哌啶基-1-丙酮盐酸盐、1-(4-氨基苯基)-2-吗啉基-1-丙酮盐酸盐，1-(4-氨基苯基)-2-二乙胺基-1-丙酮盐酸盐、1-(4-氨基苯基)-2-正丁胺基-1-丙酮盐酸盐。

Three kinds of ionic liquid were used to support the acetylacetone at the C3 position directly according to the method indicated above. These synthesized ionic liquid supported acetylacetone catalysts include imidazolium salts ionic liquid supported acetylacetone catalysts, pyridinium salts ionic liquid supported acetylacetone catalysts and ammonium salts ionic liquid supported acetylacetone catalysts. All these catalysts were characterized by ~1H-NMR,~(13)C-NMR, IR and elementary analysis.

采用设计过程中预期能够提高乙酰丙酮金属催化剂催化氧化活性的修饰方式，合成了三类离子液体支载的乙酰丙酮金属催化剂：咪唑型离子液体支载乙酰丙酮金属催化剂、吡啶型离子液体支载乙酰丙酮金属催化剂、胺型离子液体支载乙酰丙酮金属催化剂，并采用核磁共振氢谱、碳谱，红外光谱及元素分析来对这些新型的催化剂进行了表征。

The reaction catalyzed by DAK converts DHA into dihydroxyacetone phosphate which is no toxic and can be ustilized by yeast cells. DAK presents in most organisms. DAK genes in the Saccharmyces cerevisiae and P. pastoris were cloned and characterized by a combined genetic and biochemical approach and the proteins encoded by these DAK genes are homodimer.

二羟基丙酮对酵母细胞来说是种有毒的化合物，在酵母菌中二羟基丙酮激酶参与二羟基丙酮的脱毒作用，DAK催化的反应使二羟基丙酮磷酸化，形成无毒性的磷酸二羟丙酮，可为酵母细胞所利用。

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。