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Related Concept Videos

Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia

Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone.
When dissolved in liquid ammonia, an alkali metal, such as sodium, dissociates into a...
Steel Manufacturing01:26

Steel Manufacturing

Steel manufacturing is a multi-stage process that begins by smelting iron ore into cast iron in a blast furnace. This initial stage involves layering iron ore with coke, a type of fuel, and crushed limestone within the furnace. The coke is ignited with a high volume of air, leading to the creation of carbon monoxide, which acts to reduce the iron ore to pure iron.
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
Preparation of Amines: Alkylation of Ammonia and Amines01:30

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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
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Ammonia Synthesis at Low Pressure
08:14

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Published on: August 23, 2017

Ironmaking with ammonia at low temperature.

Sou Hosokai1, Yoshiaki Kasiwaya, Kosuke Matsui

  • 1Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University, Kita-ku, Sapporo, Japan.

Environmental Science & Technology
|December 4, 2010
PubMed
Summary

Ammonia can be used for carbonless ironmaking by reducing hematite. This process shifts from direct to indirect reduction with increasing temperature, yielding pure iron at higher temperatures.

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Area of Science:

  • Metallurgical Engineering
  • Chemical Engineering
  • Materials Science

Background:

  • Conventional ironmaking relies on coal, leading to significant carbon emissions.
  • Developing alternative, lower-temperature, carbonless ironmaking processes is crucial for environmental sustainability.

Purpose of the Study:

  • To investigate the reduction of hematite using ammonia as a reducing agent for potential carbonless ironmaking.
  • To examine the effect of temperature on the reduction products and mechanisms.

Main Methods:

  • Hematite reduction experiments were conducted using ammonia at varying temperatures.
  • The reaction products were analyzed to determine the reduction mechanisms and efficiency.

Main Results:

  • Ammonia reduction of hematite initiates at 430 °C.
  • The reduction mechanism transitions from direct to indirect reduction above 530 °C.
  • Pure metallic iron is produced at 600-700 °C, while iron nitride forms at 450 °C.

Conclusions:

  • Ammonia shows promise as a reducing agent for carbonless ironmaking.
  • This process operates at significantly lower temperatures (600-700 °C) compared to conventional methods (900 °C).
  • Further research can optimize ammonia-based iron production for environmental benefits.