查询词典 catalytic action

The experimental process on synthesis of roxithromycin was studied by using erythromycin oxime and MEMC as raw material under the catalytic action of anhydrous sodium carbonate.

研究了以无水碳酸钠为催化剂，红霉素肟与甲氧基乙氧基氯甲醚为原料，一步合成罗红霉素的实验过程。

The aim of this thesis is to synthesize some new chiral quaternary ammonium salts and bis-quaternary ammonium salts from the popular material------Chloramphenicoland abietic acid, and then we used these chiral quaternary ammonium salts in some substitution reactions and addition reactions in order to research their catalytic action and asymmetric induction.

本文利用廉价易得的手性物质——氯霉素和去氢枞酸为初始原料，合成了几种新的季铵盐类手性相转移催化剂，扩大了手性相转移催化剂的来源，并把它们应用于取代反应和加成反应，以探讨其催化机理和不对称诱导效应。

The catalytic action of various kinds of functional coordination compound and metallomicelles which are made from the complex and micelle, as mimic hydrolase or peroxidase, have been studied respectively in catalyzing the carboxylic ester and phosphatic diester hydrolysis, and the phenolic derivant oxidation in this paper. Some novel results of academic significance have been obtained.

本文以不同类型的功能配合物及其与表面活性剂形成的金属胶束作为水解酶和过氧化物酶的模拟酶模型，分别研究它们对羧酸酯、磷酸二酯水解反应和酚类氧化反应的催化作用，取得了新的有学术意义的成果。

The catalytic action of various kinds of functional coordination compound and metallomicelles which are made from the complex and micelle, used as mimic hydrolase or peroxidase, have been studied respectively in catalyzing the phosphatic diester hydrolysis and the phenolic derivant oxidation, in the paper.

通过研究模拟酶了解天然酶的结构、性质和功能之间的关系，探索酶催化反应机理，为设计、合成结构简单、高活性、高选择性和反应条件温和的理想催化剂奠定理论基础，开发出具有实用价值的绿色催化剂。

Methods In the medium of H2SO4, the catalytic action of Feon the oxidation of dibromomethyl carboxyazo by KIO4 was effectively inhibited by EDTA with α,α'-dipyridyl as an activator of the reaction.

方法在硫酸介质中，以α，α'-双吡啶为活化剂，Fe催化碘酸钾氧化二溴对甲基偶氮羧的反应可被微量EDTA有效阻抑，被过量EDTA有效终止。

The method comprises heating up the lactic acid solution to gasify at 150-200 degree C, mixing the obtained mixed vapour of lactic acid and water with the carrier gas, entering into gas-solid catalytic reactor to get the reaction product gas by the action of a modified Y zeolite molecular sieve catalytic agent and dewatering after heating up the mixed gas to 200-450 degree C, obtaining the propenoic acid solution through gas-liquid dissociation after cooling the reaction product gas, obtaining coarse propenoic acid products form the propenoic acid solution by gas stripping, azeotropic distillation, extraction and rectification in turns.

其特征在于将乳酸水溶液加热至150～200℃气化得到的乳酸-水混合蒸气与载气混合，将混合后的气体继续加热到200～450℃后进入气-固相催化反应器中经改性Y沸石分子筛催化剂作用脱水得反应产物气体，反应产物气体冷却后经气液分离得到丙烯酸溶液，丙烯酸溶液再依次经过气提、共沸蒸馏或萃取、精馏得到粗丙烯酸产品。

Pentanediol reacted with phosphorus tribromide to make it mono-bromination, under the catalytic action of PPTs it reacted with 2,3-dihydropyran to protect another hydroxy group, then to react with triphosphine, produced quarterphossal.

再以1，5-戊二醇为原料，三溴化磷使之单溴代，得到5-溴-1-戊醇，在对甲苯磺酸吡啶盐的催化下与2，3-二氢吡喃反应保护其另一端的羟基，与三苯基膦反应生成季磷盐。

Increased rate of reaction, in the presence of catalyzers, is called catalysis, or catalytic action.

有催化剂时，反应速度的加快叫做催化作用。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。