查询词典 hazel alder

Chiral amine-protonic acids are highly efficient and excellent enantioselective organocatalysts developed in recent years. They have been successfully applied to a number of enantioselective organic reactions, such as asymmetric aldol condenstion, Michael addition, Diels-Alder cycloaddition, Strecker reaction and so on.

手性胺-质子酸是近年来发展起来的新型高效、高对映选择性的有机催化体系，已成功应用于催化不对称Aldol反应、Michael加成反应、Diels-Alder反应和Strecker反应等许多重要的有机合成反应。

The Research about the Synthesis of Phenylsulfonyl α,β-unsaturated Ketones and Their Applications in Asymmetric Diels-Alder Reaction Catalyzed by Lewis Acid and Chiral Titanium Reagents.

苯磺酰基取代的α，β-不饱和酮的合成及其在不对称催化Diels-Alder反应中的研究中文名称：苯磺酰基取代的α，β-不饱和酮的合成及其在不对称催化Diels-Alder反应中的研究

The Sm or Yb complexes were tested to be used as a catalyst for the Diels-Alder reaction of cyclopentadiene with methyl acrylate.

用α-亚磺酰基-N，N-二取代乙酰胺同三氯化钐和三氯化镱反应得到了相应的稀土配合物，用元素分析、红外光谱进行了结构表征。

Theoretical Study on the Reaction Mechanism for Diels-Alder Cycloaddition of C50 D(subscript 5h) with 1, 3-Butadiene and 2, 3-Disubstituted 1, 3-Butadienes

篇名 C50D(下标 5h与1，3-丁二烯及2， 3-二取代的1， 3-丁二烯的Diels-Alder环加成反应机理的理论研究

This dissertation is concerned with the approaches to a new high density liquid fuel , tetrahydrotricyclopentadiene, which can be synthesized with dicyclopentadiene as raw materials by three steps: Diels-Alder reaction, separation and hydrogenation.

本文以双环戊二烯为原料，通过双烯加成、分离、加氢反应得到目的产物——新型高密度液体燃料四氢三环戊二烯，主要研究内容包括： 1。三环戊二烯的合成采用两种方式对TCPD的合成进行了研究：DCPD直接热聚法、DCPD与环戊二烯双烯加成法。

Density functional theory calculations at the B3LYP/6-31G level of theory were employed to study the mechanism and the potential energy surface of Diels-Alder reactions between Lewis base stabilized borabenzene and dienophiles.

采用密度泛函理论方法在B3LYP/6-31G水平上研究了Lewis碱稳定的硼代苯与一些亲二烯体的两种可能的Diels-Alder反应的微观机理和势能剖面，并研究了反应的溶剂效应和取代基效应。

Hazel: Yeah, she is always cleaning out her closet, and that artisan can really play with

是的，她总是在收拾她的壁橱。

Hazel of western United States with conspicuous beaklike involucres on the nuts.

美国西部的榛子，在果儿上有显著的鸟嘴状的花被。

In early morning,the hazel hill was not aroused by the first sunshine;sleeping in the humid bosk,the loquacity cuckoo only mumbled once in a while.

清晨，淡褐的山岭还未被阳光唤醒，爱唱的布谷，也睡在湿润的树丛里只偶尔发出一两声呢哝。

Touch of hazel,starred with bristly black lashes and slightly tilted at the ends.

褐色， 用短而硬的在尾端翘起的睫毛点缀着。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。