催化的

B3LYP/6-311++G** calculations were carried out to study the trimethylamine catalyzed Baylis-Hillman reaction between acraldehyde and formaldehyde.

采用密度泛函DFT-B3LYP方法在6-311++G**基组下计算研究了三甲胺催化的丙烯醛和甲醛的Baylis-Hillman反应的微观过程，获得了两种反应通道(分别对应于顺式-丙烯醛和反式-丙烯醛)的势能面。

The C〓-symmetric chiral bisoxazoline derivatives have recently been employed as ligands in a wide variety of metal-catalyzed asymmetric reactions.

在最近十几年中，具有C〓对称性的手性双噁唑啉作为配体被广泛应用于各种金属催化的不对称合成反应，并获得了良好的立体选择性，在某些反应过程中已表现出近似化学酶的功能。

The match of the acidity and basicity is very important to obtain good reactivity and high yield in the bifunctional organocatalyst system.

在双功能催化的Aldol反应中，要获得高的反应活性和好的收率，催化剂的酸性基团和碱性基团的酸碱强弱匹配非常重要。

In the meantime, we proposed a mechanism for this catalytic reaction. According to the possible formation of intermediate B, we designed a disubstituted ketene of more function to re-capture the zwitterion.

在同位素标记基础上，我们推测了这个N-甲基咪唑催化的二组分反应可能的机理，并根据此机理设计用一个二取代的烯酮来捕捉N-甲基咪唑和DMAD形成的两性离子。

Having experimented and studied of photocatalyses by ultraviolet rays and titanium dioxide which in millicron state,then,we applied photocatalysis technology of millimicron material to relevant luminaire.

本文通过紫外线与纳米级TiO2 材料进行光催化的试验研究，然后将该项技术应用到相应的灯具上，使常用的照明灯具在室内起到了空气净化的作用，改善了生活环境和工作环

In recent papers [14,15] good activity and selectivity in the epoxidation of limonene, cyclohexene, 1-octene and pinene by anhydrous and aqueous H2O2 catalyzed by alumina were reported.

近年来，用氧化铝催化的，用无水的和含水的H2O2将莱烯、环己烯、1－辛烷和蒎烯环氧化中良好的活性和选择性已有报道。

The recent Madame de Pompadour – Images of Mistress exhibition at the National Gallery in London is an example as is the Bodyworks exhibition which uses human body parts presented in a non-museum space.

在这些创造、质疑、支持定位的过程中、想像与再次想像的过程中，以及发现的过程中，物件与艺品——这些真实的典型——扮演著催化的角色。

The results indicated that:(1) It is viable to use the electron affinity energy of the metal atom in the catalyst, and the ortho-/para-substition ratio of phenolic model compounds as parameters. Thereby, the related data of Resole resins catalyzed by different catalysts can be put into the same training set for modelling.

研究结果表明：（1）用催化剂中金属原子的电子亲合能和酚醛模型化合物的邻／对位取代比作为特征参数是可行的，因而可将不同类型催化剂催化的Resole树脂的有关数据合并于同一训练集中进行建模。

In the second part, the first example of Lewis acid catalyzed 1, 3-cycloaddition between nitrones and alkylidene malonates was developed by using trisoxazoline 63 and Co〓.

催化剂的用量可降至1-2mol％。在论文的第二部分，我们首次研究了Lewis酸催化的硝酮与丙二酸酯类衍生物的1，3-偶极加成反应。

To our surprise we achieved the ligand 9, 11 and 29 with coordinating atoms fixing at benzylic and benzene ring positions, whose structure is unique in the planar chiral cyclophane chemistry.

以钯催化的烯丙基取代反应对配体进行了考察，硫醚或硒醚取代基在苄位取代的配体表现出更高的反应活性和更高的对映选择性，配体9和11均给出最高为94％的ee值。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。