不对称

It has become attractive to asymmetrically synthesize of chiral drugs through "environmentally friendly" biotransformations.

利用&环境友好&的微生物或酶催化方法进行手性药物的不对称合成已成为一个极具吸引力的方向。

The conclusions are summarized as follows:Overall industry value chain—The profit among each segment is asymmetrically distributed.

实证研究结果如下：就整体产业价值链而言，根据假说检定结果发现各环节之间的利润呈现不对称分布。

The asymmetric distributions of the surface optical second harmonic generation through azimuthally angular scans for thin silver films deposited on Si(111) wafers have been detected with different polarizations of output beams.

实验发现成长於Si(111)基板的银薄膜，以入射基频光、反射二次谐波的不同偏振组合观察到有不对称的方位角二次谐波强度分布之情形。

Pfizer is offering $68 billion for its rival, belying the current economic gloom.

辉瑞制药公司向其对手提出高达680亿美金的收购价，这于当前萎靡的经济状况有些不对称。

The asymmetric hydrogenation of prochiral ketones is one of the most efficient methods of producing enantiomerically enriched secondary alcohols. The ruthenium complex RuCl_2[P(C_6H_5)_3]_2--DPEN(DPEN=1, 2-diphenylethylene-diamine) was applied to the asymmetric hydrogenation of benzalacetone.

具有光学活性的烯丙基醇是合成许多生理活性药物的重要中间体，前手性酮不对称加氢反应是制备具有光学活性仲醇的一种重要方法。

Computationalresults indicate that the no-planar trans-benzanilide is the most stable structure. The spectra indicate that the Franck Condon region photodissociation dynamics have multidimensional character withnine activemodes. The intensity of υ24 mode in methanol is much stronger than that in acetonitrile. Compared with fatty amides and benzamide, phenyl substitution for H atom on-NH2 group makes C=O solvent effects disappear.

结果表明，苯甲酰苯胺的非平面反式结构为最稳定结构；在Frank-Condon区域内，苯甲酰苯胺主要由9个活性振动模组成；其中ν24（苯环上C＝C不对称伸缩振动和CCH的面内弯曲振动，NH面内弯曲振动）振动模在甲醇溶剂中的强度远远大于其在乙腈的强度；与脂肪酰胺类化合物和苯甲酰胺的研究结果比较发现，苯基取代－NH2上的H原子使得C＝O不再具有明显的溶剂效应。

Chiral N, P bidentate ligands, were used for the first time in Ag -catalyzed asymmetric addition of allyltributyltin to benzaldehyde.

在此催化体系中，MAP系列氮膦配体的不对称诱导性能明显好于H〓-MAP系列的氮膦配体。

Optically active axially dissymmetric binaphthyl derivatives have been extensively used as excellent chiral ligands in asymmetric catalysis and chiral recognition.

光学活性的联萘衍生物以其独特的立体化学性质作为优异的C2轴手性诱导源，已被广泛地应用到不对称催化反应和手性识别中。

The invention comprises a cyclopalladated catalyst with axial chiral binaphthyl backbone containing phosphine ligand as well as the synthesis thereof, and the application of the catalyst with cyclopalladated catalyst with axial chiral binaphthyl backbone containing phosphine ligand with a similar structure to the hetero atom norbornadiene ring cleavage reaction through an asymmetric catalytic organic boron agent.

本发明包括一类具有轴手性联萘骨架含膦配体的环钯催化剂及其合成，以及其与具有类似结构的轴手性联萘骨架含膦配体的环钯催化剂在不对称催化有机硼试剂对杂原子降冰片二烯开环的应用。

The intermetallic distance is 7.920(2)〓 which is nearly 2 〓 longerthan that of a analogue formed with olgobipyridine containing two bipyridine linked by〓 at 6,6'- positions.

新配体〓和〓按下列路线合成：〓为首例5，6-位连接的不对称位置取代的寡聚二联吡啶配体，〓的合成也是首次报道。

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％。