不对称

These ligands were found to be very effective in construction of quaternary carbon centers by using asymmetric allylic alkylation.

这类配体在前手性亲核试剂的不对称烯丙基化构筑手性季碳中心的反应中，显示了较好的反应活性及对映选择性。

The ligands were found to be effective in palladium-catalyzed asymmetric allylic alkylation to construct chiral quaternary carbon center.

这类配体在前手性亲核试剂的不对称烯丙基化构筑手性季碳中心的反应中，显示了较好的反应活性及对映选择性。

After hydrogenation of the double bond and the addition of alkyne to a carbonyl we introduced the N-hydroxy group by SN2 reaction.

不对称氢化和炔负离子对羰基的立体选择性加成构建了两个新的手性中心，之后用羟胺衍生物对羟基的SN2取代反应引入了羟胺片断。

SAA ligand Lh could induce asymmetric addition of terminal alkyne to aldehydes without using air-sensitive Ti4and expensive Zn2.with good result of high yield (up to 99%) and good enantioselectivities (up to 84%ee).

将SAA配体Lh应用于在无Ti_4和Zn_2的条件下促进端基炔对醛的不对称加成反应中，反应的收率普遍较高，最高达99%，对映体选择性高达84%ee。

The headquarters of conglomerates using of tunneling of internal capital market seize and plunder resources of listed companies because of the Government's restrictions on market allocation, low liquidity of capital markets, and the problem of "adverse selection" causing by serious information asymmetry and so on.

因为政府对市场配置限制，资本市场低流动性以及严重的信息不对称导致的"逆向选择"等问题使得许多的集团公司总部利用内部资本市场利益输出行为侵占、掠夺上市公司资源。

Lightfoot et al have developed one of these iridium-based systems for the stereocontrolled synthesis of lilial by asymmetric reduction of an allyl alcohol and subsequent oxidation of the alcohol.

Lightfoot等发展了一种基于铱的系统，通过烯丙醇和第二阶段酒精氧化的不对称还原，用来进行铃兰醛的立体控制合成。

Synthesis and application of 1, 1'-ferrocene P, N -ligands in enatio- and regio-selective palladium-catalyzed allylic substitution reactions

1， 1'-二茂铁膦氮配体的合成及其在不对称区域选择性钯催化烯丙基取代反应中的应用

Chiral N,P ligand 5 was examined for the asymmetric allylic alkylation of 1,3-diphenyl-2-propenyl acetate with up to 89% yield and up to 81.6% ee.

化合物5用于钯催化的1，3-二苯基-2-烯丙基乙酸酯的不对称烯丙基烷基化反应，产率为89%，对映体过量最高为81.6% ee。

This thesis focused mainly on studying the role of planar chirality in asymmetric catalysis, synthesizing novel ferrocene ligands and applying them to palladium-catalyzed allylic substitution reactions.

本论文主要是研究二茂铁平面手性在不对称催化反应中的作用，设计合成新型二茂铁配体及其在钯催化烯丙基取代反应中的应用。

At the same time, from the angle of complexity of public information resources management it comprehensively proves insufficiency of the government public information service such as discriminatory service, mandatory service, asymmetrical service and rough service, which not only increase the government management cost but also lead to the structural form rupture of public information resources management at various levels, such as the government and the public, super and subordinate governments, central and local governments, and consequently break the almightiness mythology of government monopoly in public information resources management.

同时，从公共信息资源管理的复杂性角度全面论证了政府公共信息服务的不足，如差别服务、强制服务、不对称服务以及粗糙服务等不仅造成了政府管理成本的攀升，而且也导致政府与公众之间、上下级政府部门之间以及中央与地方之间等不同层面公共信息资源管理的结构型断裂，并在事实上打破了政府垄断公共信息资源管理的全能神话。

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％。