查询词典 allylic

Allylic oxidation was one of the key steps. Weemployed PDC +〓 combined system and gained better results. PathB is an absolutely new design.

烯丙位氧化是A路线关键的一步，难度较大，本文特别研究了用PDC+〓混合体系进行氧化，并取得了较好的结果。B路线是完全新设计的路线。

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。

It revealed that the gaseous oxygen was related to the deep oxidation of hydrocarbon, since the breakage of C-C bond in allylic intermediate didn＇t exist during the process of reaction. This is due to the weak ability of lattice oxygen to attack hydrocarbon molecular.

实验结果指出，烃类的深度氧化反应与气相氧的存在有关，晶格氧对烃分子中碳碳键的攻击较弱，反应中烯丙基中间体几乎不发生碳碳键的断裂。

On the basis of aerobic oxidation ofβ-ionone catalyzed by supported catalysts/butyraldehyde system,a series of cycloolefines such as cyclohexene,β-methylionone,α-ionone,andα-pinene were oxidized under the general conditions to give corresponding epoxides and allylic oxides.

将三种催化体系CMPS-Co_2/正丁醛、Co_2/SiIm-正丁醛、MoO_2_2/SiIm-正丁醛推广应用到不同环烯烃催化氧化反应，虽然各反应底物之间的转化率和氧化选择性变化很大，但对三种催化体系横向比较而言，其催化氧化情况相当。

Two special structural features of the sulfonium salt were proved to stabilize its corresponding ylide and depress the 2,3-sigma rearrangement. One is that there is a trimethylsilyl in the end of the allylic double band. This silicon atom can stabilize a α-carbon anion and the corresponding ylide. Another is that there is hydroxy group in the beta-position of sulfonium atom. The oxygen of this hydroxy group may stabilize the sulfonium cation.

为了稳定生成的烯丙基硫叶立德，并抑制它的2， 3-sigma 重排反应，在硫叶立德结构上做了两方面的考虑：一是在烯丙基双键的未端引入硅基，利用硅原子对 a -碳负离子的稳定作用来稳定烯丙基硫叶立德；二是在硫原子的 b -位引入羟基，利用羟基氧对硫正离子的作用来稳定硫叶立德。

HCo 〓-catalyzed hydroformylation and isomerization of allene and propyne Allene hydroformylation favors the linear anti-Markovnikov product in high regioselectivity both kinetically and thermodynamically. The origin of this regioselectivity comes from the enhanced stability of the η〓-allylic intermediate (η〓-CH〓CHCH〓 Co 〓.

HCo〓催化的丙二烯和丙炔氢甲酰化反应及异构化反应 HCo〓催化丙二烯氢甲酰化反应的区域选择性主要由不可逆的丙二烯插入步骤决定，动力学和热力学因素都有利于形成anti-Markovnikov中间物种(η〓-CH〓CHCH〓)Co〓，形成Markovnikov中间物种Co〓是不具有竞争性的。

The system exhibits favorable catalytic activity for the oxidation of benzylic and allylic alcohols, in spite of low activity observed for the oxidation of heterocyclic and aliphatic alcohols.

探讨了TEMPO-IL/CuCl催化体系的催化机理，铜离子是反应的活性中心。针对 TEMPO/CuCl 催化体系反应速度较慢的问题，研究了碱对 TEMPO/CuCl 体系的促进作用。

Various alcohols are tolerable under the present conditions including benzylic alcohols,allylic alcohols as well as simple aliphatic alcohols.

醇的范围非常广，二苯甲醇、1-苯乙醇、烯丙醇衍生物等含苄醇结构的地物能够以最高接近定量的产率得到产物。普通烷基醇如环己醇，甚至最简单的甲醇和乙醇也能顺利反应，产率中等。

Various alcohols are tolerable under the present conditions including benzylic alcohols,allylic alcohols as well as simple aliphatic alcohols.

普通烷基醇如环己醇，甚至最简单的甲醇和乙醇也能顺利反应，产率中等。在这个反应中，磷钨酸能够顺利回收，并在此被用于催化反应，活性没有降低。

In this thesis, investigations focused on heteropoly acids-catalyzed C-C and C-N bond formation reactions and the synthesis of xanthenediones and acridinediones under thermal conditions are described.1.12-Phosphotungstic acid has been used as an efficient,eco-friendly,and air- and moisture-stable catalyst to promote the direct dehydrative substitution of the hydroxy group of benzylic and allylic alcohols with variousβ-dicarbonyl compounds.

本篇论文主要描述了杂多酸催化下的C-C和C-N键的生成，以及无溶剂直接加热下合成十氢氧杂蒽二酮和9-芳基十氢吖啶二酮。主要内容如下：1。在磷钨酸催化下，1，3-二羰基化合物与醇能够顺利偶合，脱除一分子的水，生成烷基化的1，3-二羰基化合物。反应在甲苯中进行时，二芳基甲醇能与各类1，3-二羰基化合物反应，成率很高；但对于1-苯乙醇，只能得到很低的产率。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新