Sodium Liquid Ammonia
Sodium Liquid Ammonia - Related Videos
02:10
Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia
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2023
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...
08:14
Ammonia Synthesis at Low Pressure
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Cited by 17 •
2017
Ammonia can be synthesized at low pressure by using a conventional catalyst and an ammonia selective absorbent.
06:27
Fast and Accurate Exhaled Breath Ammonia Measurement
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Cited by 16 •
2014
Ammonia is an important physiologic metabolite relevant to various disease and wellness states. It is also a difficult molecule to measure in breath, which demands particular precautions be taken to obtain accurate results. Not all factors influencing ammonia are known, but progress can be difficult without accounting for these factors.
12:05
Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia
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Cited by 15 •
2013
Herein the procedures for plasma enhanced chemical vapor deposition of perfluoroalkanes on microporous materials such as metal-organic frameworks to enhance their stability and hydrophobicity are described. Furthermore, breakthrough testing of milligram quantities of samples is described in detail.
01:30
Preparation of Amines: Alkylation of Ammonia and Amines
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2025
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...
FAQs
The sodium atoms transfer electrons to ammonia, where the electrons become solvated rather than remaining attached to individual sodium atoms. This mobile electron population can enter redox reactions with other molecules, including aromatic compounds. Consequently, the solution functions as a powerful reducing medium, and its chemistry reflects both electron transfer and stabilization of electrons by the ammonia solvent.
At relatively lower concentrations, solvated electrons give the solution a deep blue color. As the concentration increases, the electrons can pair, changing the appearance toward bronze or even metallic. This color progression therefore provides a visible indication that the electronic state of the solution has changed, although it does not by itself specify the outcome of a particular reaction.
Alcohols can provide proton sources during reductions performed in this medium. That proton availability becomes especially important in dissolving-metal chemistry, including the Birch reduction, because electron transfer and proton delivery work together to determine how an aromatic compound is reduced. Changing whether an alcohol is present therefore changes the reaction environment and can influence reaction control.
A reaction begins by forming the sodium-ammonia medium so that electron transfer from sodium produces solvated electrons. The selected substrate, such as an aromatic compound, then encounters this reducing environment; when an alcohol is included, it supplies protons during the process. This sequence links solvent formation, electron delivery, and proton availability to the observed chemical transformation.
Its principal applications arise from its ability to support dissolving-metal reductions. Researchers can use the medium to study reductions of aromatic compounds and to examine the Birch reduction when alcohols serve as proton sources. More broadly, it provides a system for investigating how solvated electrons behave, how redox reactions proceed, and how reaction conditions influence chemical outcomes.
Both components require careful handling because metallic sodium and liquid ammonia are highly reactive materials. The concern is not limited to the final solution: preparing the medium combines two substances that demand controlled laboratory practice. In chemistry research, this hazard context is essential when interpreting the method's usefulness, since the strong reducing behavior that enables applications also contributes to handling risks.