查询词典 acetoacetate

A novel route for synthesis of methyl acetoacetate from acetone and dimethyl carbonate over solid base catalysts was proposed.

以碳酸二甲酯与丙酮为原料，在固体碱上合成乙酰乙酸甲酯，并考察了反应温度、反应时间、催化剂用量和原料摩尔比等因素对反应结果的影响。

Methods A DB-WAX capillary column was used with FID as detector and acetoacetate as the solvent.

采用 DB-WAX 毛细管柱， FID 检测器，乙酸乙酯为溶剂。

KF/NaZnPO4 was used as the catalyst for Michael addition reaction of ethyl acetoacetate and acrylonitrile.

以磷酸锌钠负载KF为催化剂，催化乙酰乙酸乙酯与丙烯腈进行Michael 加成反应。

The condensation of 3-Ethoxyphthalide was also conducted with ethyl acetoacetate and ethyl cyanoacetate.

对3位延伸出一个和两个碳原子的胺类衍生物的质谱裂解规律进行了探讨。

The synthesis of fructone from ethyl acetoacetate and ethylene glycol using sulfonated activated carbon as solid acid catalyst was investigated.

以活性炭磺化制得新型固体磺酸磺化炭为催化剂，对乙酰乙酸乙酯和乙二醇合成苹果酯的催化工艺进行了系统研究。

However, in the setting of an elevated serum anion gap acidosis, other anions such as acetoacetate or lactate are present, thus rendering the urinary anion gap a useless test.

但是在阴离子间隙增大的酸中毒中存在其它的阴离子，如酮酸酸中毒时的乙酸乙酯或乳酸酸中毒时的乳酸。这时检测尿阴离子间隙就没有什么意义了。

Various reaction parameters such as ratio of ethyl acetoacetate to ethylene glycol,catalyst amount,reaction time and water-carrying reagent amount were studied.

讨论了酯醇比、催化剂用量、反应时间、带水剂用量对酯化率的影响。最佳反应条件为：n：n=1：1.8，催化剂用量为乙酰乙酸乙酯质量的2%，带水剂用量为20mL，反应时间3h。

The strongly acidic cation exchange resin catalyzed synthesis of fructone-B by the reaction of ethyl acetoacetate and 1,2-propanediol was studied.

以硫酸高铈铵为催化剂，通过乙酰乙酸乙酯分别与乙二醇和1，2-丙二醇反应合成了苹果酯-A和苹果酯-B，研究了催化剂等有关因素对产品收率的影响。

A series of methyl 2,7,7-trimethyl-5-oxo-4-aryl1,4,5,6,7,8- hexahydroquinoline -3-carboxylate were synthesized by the reaction of aromatic aldehydes,dimedone and methyl acetoacetate using ammonium acetate as catalyst in glycol under microwave irradiation with 82%～98% yields in 4～6 min.

微波辐射下以芳醛、达咪酮、乙酰乙酸甲酯为原料，乙二醇为溶剂，醋酸铵为催化剂合成了一系列2，7，7-三甲基-5-氧代-4-芳基-1，4，5，6，7，8-六氢喹啉-3-羧酸甲酯化合物，反应时间4~6 min，产率82%~98%。

However, in the setting of an elevated serum anion gap acidosis, other anions such as acetoacetate or lactate are present, thus render ing the urinary anion gap a useless test.

但是在阴离子间隙增大的酸中毒中存在其它的阴离子，如酮酸酸中毒时的乙酸乙酯或乳酸酸中毒时的乳酸。这时检测尿阴离子间隙就没有什么意义了。

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。