还原性

Asymmetric hydroboration is a kind of widely applied and valuable reaction, in which borane reduction of prochiral ketones reaction is an important method.

不对称催化硼氢化反应是应用广泛且具有工业价值的反应，其中的硼烷还原前手性酮反应有着举足轻重的作用。

Using 10 as the catalyst, six prochiral ketone s were reduced enantioselectively with borane and the results were compared with those with 1,1- diphenylprolinol as catalys.

用10催化6种前手性酮的不对称硼烷还原反应，其结果与-二苯基脯氨醇催化的同一反应的结果进行了对比。

In the reduction of 1, 6-diphenyl-1, 6-hexanedione catalyzed by the bis-squaryl proline, good enantioselectivities were obtained, the ee values were up to 90%.We also studied the asymmetric borane reduction of prochiral ketone catalyzed by a series of thiazolidine ligands.

本文考察了由L-半胱氨酸衍生的2-位无取代基的以及2-位芳基取代的噻唑烷酸及醇配体在前手性酮的不对称还原反应中的催化性能。

The proteins are hydrolysed throughmultiple stages into amino acids that are further fermented into volatile fatty acids, carbon dioxides, hydrogengas, ammonium and reduced sulphur.

蛋白质是通过多阶段水解成氨基酸，再发酵成挥发性脂肪酸、二氧化碳、氢气、氨、还原态硫。

The influence of different dispersers and lignin,and different disperser-lignin formulation s on the dispersibility of vat brown BR was studied.

研究了不同的分散剂、木质素以及分散剂间、分散剂与木质素间复配比对还原棕BR扩散性的影响。

In the fifth part, asymmetric synthesis of β,γ-trans-alkenyl α-amino esters was achieved by chiral phosphoric acid catalyzed transfer hydrogenation of β,γ-alkynyl α-imino esters. Utilizing Hantzsch ester as the hydrogen donor, both the alkyne and imine moieties of β,γ-alkynyl α-imino esters were reduced to yield β,γ-trans-alkenyl α-amino esters with up to 96% ee.

第五部分工作中，使用手性磷酸作为催化剂，Hantzsch酯作为氢源，β，γ-炔烃取代的α-酮酸酯亚胺中的炔键和亚胺官能团均被还原，以中等的收率和优秀的对映选择性（up to 96% ee）得到β，γ-反式烯烃取代的α-氨基酸衍生物。

Asymmetric reduction of prochiral ketone to these chiral alcohol s by active microbe cells is one of the most promising routes.

以4-氯苯乙酮为苯环上含卤素的芳香酮的模型底物，研究了活性酵母细胞在水相体系中催化该类芳香酮不对称还原合成相应手性醇的反应特性。

This method had been applied to determination of the optical purity of the asymmetric reduction products of prochiral ketones.

拆分方法已应用于潜手性酮不对称还原产物的光学纯度的鉴定，并取得了很好的效果。

The advances in asymmetric reduction of prochiral ketones to chiral alcohol s with biocatalysis are reviewed.

综述了国内外利用生物催化羰基的不对称还原合成手性醇的研究情况。

Analyzing the relationships among the initial yielding point, significant yielding point, ultimate point and other key point in parameterless pushover curves, considering the seismic design level, the parameterless pushover curves are transformed to general pushover curves. Then the general pushover curves are converted to a spectral capacity curves for building, that is, a plot of spectral acceleration versus spectral displacement, using the simplified nonlinear static analysis method to estimate the seismic vulnerability of multistory brick structure and multistory and high rise reinforced concrete.

分析了无量纲坐标描述的推倒曲线中初始屈服点、明显屈服点及极限点等关键点之间的关系，考虑建筑物地震设防水准，将无量纲坐标描述的推倒曲线还原为以侧力及其位移描述的推倒曲线，进而将其转换为以谱加速度及谱位移表示的承载能力曲线，采用简化结构静力非线性分析方法，估计我国多层砖房及缺乏震害经验的多、高层钢筋混凝土框架结构房屋的地震易损性。

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。