金属氢

Whenpyridine was used as reductive decomposing agent, the expecting cholest-4-en-3,6-dione-22-al was obtained. However, when Zn/HOAc was used to decomposethe ozonide, C-4,5 double bond was further reduced to give cholest-3,6-dione-22-al as main product. 2 For the side-chain construction of compound (1), the solid-liquid phase-transfer Wittig reaction was used. When (3-methyl-2-oxobutyl)-triphenylarsonium bromide was used as reagent, the reaction can be carried out inmild reaction condition and the yield is higher than that when phosphorane wasused.

但使用Zn／HOAc作为分解剂时，却得到其氢化产物胆甾-3， 6-二酮-22-醛；2在甾体支链引入过程中，采用固-液相转移Wittig反应的方法，用(3-甲基)-2-氧丁基三苯基溴化胂作为试剂，反应在非常温和的条件下便可完成，而且产率比传统采用膦烷的方法更高；3在对某些甾酮化合物的选择性还原反应研究时，发现在〓还原体系中，当加入某些金属离子后，反应有更好的区域选择性和立体选择性。

In recent years, various skeletal derivatives have been synthesized with organic metals as catalysts, and different side-chain derivatives have been obtained with the reaction of pyrrolidine and hydrophobic functional groups.

近年来，采用有机金属催化合成骨架、四氢吡咯烷与疏水基团相连接合成侧链，取得了一定的进展。

Up to 97% ee was also obtained in the asymmetric hydrogenation of the more difficult and less studied 2,3-disubstitued quinoline derivatives.

以手性二胺与金属铱形成的配合物Cp*Ir(CF3TsDPEN)为催化剂，研究了在空气条件下喹啉衍生物的不对称氢化反应。

Michael addition reaction must be carried out in the base of the catalyst, the alkali used are: sodium, sodium ethoxide, sodium hydride, sodium amide ...

迈克尔加成反应必须在碱的催化下进行，常用的碱有：金属钠、乙醇钠、氢化钠、氨基钠。。。

As the RE ions concentration in groundwater increases or the surface sites on Mn-Fe oxide become saturated, RE ions may sorb via surface precipitation, then surface precipitation become the dominant sorption mechanism.

当离子浓度低时，形成表面络合物是占统治地位的吸附机制；当氧化物/水体系中离子浓度大时，金属离子除在表面形成表面络合物外，也可能形成表面氢氧化物沉淀，直到氧化物表面吸附点位被全部占满，这时表面沉淀则变成主要的吸附机制。

Cracking of a metal resulting from the combination of hydrogen and tensile stress.

在氢和张应力的共同作用下金属发生的断裂。

Full study including theory and experiment about hydro-oxygen turbopump rotor system showed that MR has special advantages as combined bearing.

通过对带金属橡胶阻尼器的氢氧涡轮泵转子进行了实验研究及其理论分析。

Such one-dimensional chains interconnect via hydrogen bonding and π-π interaction to form an extended undulated sheet-like structure.

经配体桥联的两个金属离子的距离是6.703〓。这样的一维链通过配体的NH部分〓Cl及溶剂分子甲醇相互之间形成的氢键连接扩展成二维波浪状结构。甲醇分子被包容在层间。

Carbon fiber microelectrode has been used as a detector for capillary electrophoresis with end-column electrochemical detection of melatonin, sulfonamide, the traditional Chinese medicine of ash brak, thiolzoles and barbituric compounds.

碳纤维电极的应用，(2)金属 Pd 超微粒碳纤维修饰电极的应用，(3)氢醌类衍生物自组装修饰 Pt 电极的应用，(4)在柱毛细管电极的制作。

Poly( N -vinyl-2-pyrrolidone)protected nanoclusters of platinum was used as catalysts in the hydrogenation of m -phenoxy benzaldehydeto form high purity m -phenoxy benzalcohol.

研究了常压下聚N -乙烯基 2 -吡咯烷酮保护的铂金属簇催化剂催化间苯氧基苯甲醛加氢制备高纯间苯氧基苯甲醇的反应。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。