合成物

Then, it was condensed with-valine methyl ester to form a chiral imine, which was reacted with allyl zinc bromide in the presence of CeCl3·7H2O to afford the corresponding chiral homoallylic amine with high optical activity.

-N-Boc-3-苯基-2-氨基丙醛与-缬氨基酸甲酯缩合生成手性亚胺，在七水合三氯化铈（CeC13·7H2O）催化以及底物的手性诱导作用下，该手性亚胺与烯丙基溴化锌经不对称加成反应合成了高光活性的单烯丙基化手性胺。

Two types of three-arm or four-arm star-shapedPCL-b-D,L-PLGA50 copolymer with high molecular weight and narrow molecularweight distribution were synthesized via the block copolymerization of MG monomerwith star-shaped hydroxy-terminated PCL as macroinitiator and 〓 as catalyst.

以端羟基化的三臂或四臂星型PCL聚合物为大分子引发剂、〓为催化剂，引发MG单体的嵌段共聚合，合成了高分子量和窄分子量分布的三臂或四臂星型PCL-b-D，L-PLGA50共聚物。

Two novel well-defined star-graft copolymers with poly as main chain are successfully prepared by combination of anionic and atom transfer radical polymerization. Anionic copolymerized 2,5-epoxypropyl-1-ethoxyethyl ether with EO by initiation of mixture of diphenylmethylpotassium and polyol [1,1,1-trispropane or pentaerythritol] to give the well-defined three-arm star poly and four-arm star poly.

用核磁共振(~1H NMR)、红外光谱、元素分析、气相色谱—质谱、凝胶渗透色谱和基质辅助激光解吸附电离飞行时间质谱(MALDI-TOF-MS)等手段对中间产物及最终产物进行了详细地表征，证明了这种合成聚醚为主链的接枝共聚物的方法是可行的，并且是成功的。2。

Axial group, substitution on the aromatic rings of SalenAlX, and co-catalyst all affect catalytic properties of these aluminum complexes.

设计合成了一系列四齿席夫碱铝配合物，它们可以溶解在超临界CO〓／环氧乙烷混合物中，是CO〓和环氧烷烃环加成反应的有效催化剂。

We have designed and synthesized novel star shaped metal coordination compounds.

星型金属配合物材料的设计与合成。

Photoluminescence properties, electrochemical properties, and the electroluminescence properties of their single-layered PLEDs are studied.

通过Wittig缩聚合成了主链中带饱和柔性脂肪链的芴与对苯撑乙烯共聚物。

The composition and microstructure of the material were characterized by using XRD, SEM and AFM. The analysis results show that the stone was covered by a lay of calcium oxalate monohydrate thin film which is approximately 100 nm thick. The synthesis mechanism of the protective material is explained.

分别采用XRD、SEM和AFM分析表征了材料的物相组成及微观形貌，证明石材表面的防护材料为一层约100 nm厚的薄片状的一水草酸钙晶体，并解释了材料的合成机理。

In addition , the cameraman must have a knowledge of composition so that the arrangement of the people and objects in each shot will produce the desired effect.

另外，摄影师必须具备合成的知识，以便安排好每个镜头中的人和物来达到预期的效果。

249 In addition,the cameraman must have a knowledge of composition so that the arrangement of the people and objects in each shot will produce the desired effect.

参考译文另外，摄影师必须具备合成的知识，以便安排好每个镜头中的人和物来达到预期的效果。

249 In addition,the cameraman must have a knowledge of composition so that the arrangement of the people and objects in each shot will produce the desired effect.

参考译文另外，摄影师必须具备合成的知识，以便安排好每个镜头中的人和物来达到预期的效果。历年真题分析

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失