Ammonia Leaving Group
Ammonia Leaving Group - Related Videos
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.
02:14
Leaving Groups
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2023
The nature of leaving groups strongly influences the outcome of a nucleophilic substitution reaction. In general, in a nucleophilic substitution reaction, a nucleophile displaces a functional group, called the leaving group, from the substrate to give a substituted product. A leaving group departs the substrate molecule through heterolytic cleavage, taking the pair of electrons with it to become a relatively stable weak base in the form of an anion or a neutral molecule. In a nucleophilic...
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
Protonation changes a neutral amine, which is a relatively weak base and generally a poor leaving group, into an ammonium species. Departure can then produce neutral ammonia or a related neutral amine, a more favorable outcome. This acid-base change explains why reaction conditions strongly influence whether nitrogen-containing groups can leave during bond transformations.
In nucleophilic substitution, departure of the nitrogen-containing group allows another species to form a new bond at the reacting carbon. In elimination, loss of the group contributes to alkene formation instead. The same general departure event can therefore support different products, depending on molecular structure and the reaction environment.
Structure affects both the ease of nitrogen-containing group departure and the pathway that follows it. Alkylammonium salts provide a useful context because their substitution pattern influences whether bond transformation favors substitution or alkene formation. Examining the attached groups therefore helps connect molecular structure with leaving-group ability and reaction outcome.
Start by identifying whether the nitrogen-containing substituent is neutral or part of an ammonium group, then consider whether departure would produce neutral ammonia or an amine. Next, assess whether the reaction is presented as substitution or elimination and relate that pathway to molecular structure and the surrounding reaction environment.
In Hofmann elimination, loss of the nitrogen-containing group from an alkylammonium species is coupled to formation of an alkene. The departure step is therefore not an isolated event; it helps reveal how the substrate's structure directs an elimination pathway. This reaction provides a clear example of nitrogen-group loss producing a new carbon-carbon multiple bond.
Alkylammonium salts show how protonation and substitution alter the behavior of nitrogen-containing groups. Their reactions allow chemists to examine when departure produces neutral ammonia or an amine and whether the resulting bond transformation follows substitution or elimination chemistry. They therefore connect acid-base state, molecular structure, and observable reaction pathway.