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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

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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,...
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Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

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Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
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Nitriles to Amines: LiAlH4 Reduction00:55

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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.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Preparation of Nitriles01:12

Preparation of Nitriles

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One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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Nitrogen reduction and functionalization by a multimetallic uranium nitride complex.

Marta Falcone1, Lucile Chatelain1, Rosario Scopelliti1

  • 1Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

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|July 21, 2017
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Summary

Researchers developed a novel uranium complex that can cleave and functionalize inert molecular nitrogen (N2) under ambient conditions. This breakthrough offers a new pathway for synthesizing valuable compounds like ammonia and organonitrogen products from N2, potentially under milder conditions than current industrial processes.

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Area of Science:

  • Inorganic chemistry
  • Organometallic chemistry
  • Catalysis

Background:

  • Molecular nitrogen (N2) is abundant but unreactive, posing challenges for its conversion into valuable chemicals under mild conditions.
  • Existing industrial processes like Haber-Bosch operate under harsh conditions, and molecular catalysts for N2 functionalization often lack well-defined structures or further reactivity.
  • Uranium compounds have historical precedent as effective N2 fixation catalysts, but molecular uranium complexes for N2 transformation remain largely unexplored.

Purpose of the Study:

  • To synthesize and characterize a novel molecular uranium complex capable of binding and reducing N2 under ambient conditions.
  • To investigate the functionalization of the N2 ligand within the uranium complex, leading to N-H or N-C bond formation.
  • To establish a new molecular platform for mild N2 activation and conversion.

Main Methods:

  • Synthesis and full characterization of a binuclear uranium(III) complex bridged by a nitride ligand.
  • Stoichiometric reactions of the characterized complex with reagents like H2, protons, and carbon monoxide.
  • Spectroscopic and structural analysis to confirm N2 cleavage and subsequent functionalization.

Main Results:

  • A well-defined binuclear uranium(III) complex featuring a central nitride group was synthesized and characterized.
  • This complex achieved the four-electron reduction of N2 under ambient conditions.
  • Subsequent reactions with H2/protons or CO led to complete N2 cleavage and functionalization, forming ammonia or cyanate.

Conclusions:

  • A molecular uranium complex can efficiently mediate the stoichiometric transformation of N2 into valuable products like NH3 and cyanate under mild conditions.
  • The study highlights the potential of flexible, electron-rich, multimetallic, nitride-bridged core units as a foundation for designing new N2-cleaving and functionalizing molecular catalysts.
  • This work opens new avenues for sustainable chemical synthesis by enabling the activation of inert N2 under accessible conditions.