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相关概念视频

C4 Pathway and CAM01:27

C4 Pathway and CAM

Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents01:13

Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents

Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.

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Green and Low-cost Production of Thermally Stable and Carboxylated Cellulose Nanocrystals and Nanofibrils Using Highly Recyclable Dicarboxylic Acids
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一种新的方法,以特定区域和高度刻板选择的方式从碳化合物和 (三甲基) 亚甲中制备乙醇乙烯.

Varinder K Aggarwal1, Chris G Sheldon, Gregor J Macdonald

  • 1School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK. v.aggarwal@bristol.ac.uk

Journal of the American Chemical Society
|August 29, 2002
PubMed
概括

这项研究引入了一种使用 (trimethylsilyl) diazomethane 来从和中合成乙醇乙烯的新方法. 该工艺为各种替代产品提供了高产量和对区域和立体化学的优良控制.

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科学领域:

  • 有机化学 有机化学
  • 合成化学 合成化学
  • 催化剂是一种催化剂.

背景情况:

  • 乙醇乙的合成对于各种有机转化至关重要.
  • 开发有效和立体选择性方法来合成乙烯仍然是一个活跃的研究领域.
  • 现有的方法可能缺乏对区域化学的控制,或需要恶劣的条件.

研究的目的:

  • 为了研究 (trimethylsilyl) diazomethane与碳化合物的反应.
  • 开发一种新的,高产率的,和静态选择性合成的烯乙烯.
  • 为了阐明观察到的反应的机制.

主要方法:

  • (trimethylsilyl) diazomethane与化物和酸盐的反应.
  • 使用甲醇 (MeOH) 进行低温火,然后进行(II) 乙二聚合物 (Rh2(OAc) 4) 催化.
  • 用各种电友,包括乳和化 (MeI) 进行化.
  • 机械研究涉及标签,ReactIR和中间体的隔离.

主要成果:

  • 在用MeOH和Rh2(OAc) 4.4火时,获得了高产量的西乙醇乙烯.
  • 用其他电友合成终端和替代的烯乙烯以完全的区域和立体化学控制.
  • 通过使用先进的分析技术,成功地绘制了反应机制.

结论:

  • (trimethylsilyl) diazomethane 提供了一个多功能且高效的前体,用于乙醇乙合成.
  • 开发的方法提供了对产品形成的优良控制,使得各种乙醇乙烯结构的访问.
  • 机械学的见解为进一步优化和应用这种新型合成路线提供了基础.