手

There aren't a host of top-flight second basemen available -- Luis Castillo of the Mets and Kaz Matsui of the Rockies head the list -- but second base is a position more readily defined by defense than offense.

如果Cano转任三垒手，要去另外找一位二垒手不是那麼难---大都会的Luis Castillo和落矶的松井稼头央是首先可以考虑的----但这样二垒的位置就防守大於进攻了。

But because the LORD loved you, and because he would keep the oath which he had sworn unto your fathers, hath the LORD brought you out with a mighty hand, and redeemed you out of the house of bondmen, from the hand of Pharaoh king of Egypt.

7：8 只因耶和华爱你们，又因要守他向你们列祖所起的誓，就用大能的手领你们出来，从为奴之家救赎你们脱离埃及王法老的手。

Asymmetric borane reduction of prochiral ketones is a good process to the synthesis of enantiomerically enriched secondary alcohols.

硼烷对前手性酮的不对称还原是合成手性仲醇的重要方法。

Herein we mainly discuss the design of four series of chialβ-amino alcohols and their application to the asymmetric borane reduction ofprochiral ketones.

本论文主要设计合成了四个系列的手性氨基醇类的催化剂，研究了它们在硼烷对前手性酮的不对称还原反应中的应用。

All the prepared compounds were characterized by 〓H NMR、〓P NMR and elemental analysis. The catalytic activity of each prepared chiral phosphorus compound in the borane reduction of prochiral ketones was studied.

对每一种手性磷化合物，考察了其作为配体催化剂在潜手性酮的不对称硼烷还原反应中的催化效果，讨论了影响不对称诱导的各种因素。

3A series of C_2-symmetric chiralβ-amino alcoholsⅢ-6 andⅢ-10were synthesized in several steps from natural amino acids,and applied in the asymmetric borane reduction of prochiral ketones.The catalytic activity ofⅢ-6 was better thanⅢ-10.

3以天然氨基酸为起始原料，经过简单的几步反应合成了开链冠醚类C_2-对称的手性β-氨基醇Ⅲ-6以及Ⅲ-10，将其应用于硼烷对前手性酮的不对称还原反应中，含有脯氨醇结构单元Ⅲ-6的催化效果要好于由其他氨基酸衍生的Ⅲ-10，THF为溶剂，回流，催化量为10 mol%时，最高得到85%的ee值。

Oxazaborolidine, which derive from the coordination of amino alcohol and borane, are good catalysts for the borane reduction reaction. A kind of fused cyclic oxazaborolidine invented by Corey and derived from proline has been successfully used in the production of MK-0417 as excellent chiral catalyst by Merck company.

在该反应中氨基醇类配体原位与硼烷配位形成的手性恶唑硼烷是该反应的良好催化剂，其中Corey等发明的由脯氨酸出发制备的稠环手性催化剂性能优异，已经在Merck公司生产碳酸酐酶抑制剂MK-0417中得到成功应用。

S-1-phenylethanol was obtained in up to 19%ee in toluene at 0℃.(4)A series of C_2-symmetric chiralβ-amino alcoholsⅣ-5were synthesized in several steps from natural amino acid L-proline,and applied in the asymmetric borane reduction of prochiral ketones.

4以天然L-脯氨酸为起始原料，经过几步转化合成了以萘环为母体的C_2-对称的手性β-氨基醇Ⅳ-5，将其应用于硼烷对前手性酮的不对称还原反应中，同样，我们也观测到温度影(来源：Ac1BC论文网www.abclunwen.com)响产物构型的现象。

Asymmetric catalytic activity of chiral spiroborate esters,- or-1,1′-bi-2-naphthoxyboric acid-proline anhydride [-1 or-1], toward borane reduction of prochiral imine s has been ob- served.

手性螺硼酸酯-或-1，1'-联-2-萘酚硼酸--脯氨酸酐[-1或-1]对前手性亚胺硼烷还原的不对称催化活性被观察到。

Thirty-one new chiral phosphorus compounds have been synthesized starting from D-camphor,-alpha-phenylethylamine,-Betti base,-1-(4-nitrophenyl)-2-amino- propane-1,3-diol, L-amino acids (such as serine, phenylalanine, proline etc.) and their application as organocatalysts in asymmetric trimethylsilylcyanation of aldehydes and asymmetric borane reduction of prochiral ketones and ketimines were investigated.

该项目从D-樟脑、-alpha-苯乙胺、-Betti碱、-氯酶胺、L-氨基酸（如丝氨酸、苯丙氨酸、脯氨酸等）出发合成了31个新的手性磷化合物，研究了它们作为有机催化剂在醛的不对称硅氰化反应、潜手性酮的不对称硼烷还原反应以及亚胺的不对称硼烷还原反应中的催化效果。

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。