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Related Concept Videos

Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
Esters to Alcohols: Hydride Reductions01:17

Esters to Alcohols: Hydride Reductions

Esters are reduced to primary alcohols when treated with a strong reducing agent like lithium aluminum hydride. The reaction requires two equivalents of the reducing agent and proceeds via an aldehyde intermediate.
Lithium aluminum hydride is a source of hydride ions and functions as a nucleophile. The mechanism proceeds in three steps. Firstly, the nucleophilic hydride ion attacks the carbonyl carbon of the ester to form a tetrahedral intermediate. Subsequently, the carbonyl group re-forms,...
Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
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.
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...
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.

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Related Experiment Video

Updated: Jul 2, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

Multi-electron reduction from alkyl/hydride ligand combinations in U4+ complexes.

William J Evans1, Elizabeth Montalvo, Stosh A Kozimor

  • 1Department of Chemistry, University of California, Irvine, California 92697-2025, USA. wevans@uci.edu

Journal of the American Chemical Society
|August 30, 2008
PubMed
Summary

Uranium complexes achieve unprecedented multi-electron reductions via alkyl hydride reductive elimination. This reactivity, common in transition metals, is newly observed in f-element chemistry, enabling benzene reduction.

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Area of Science:

  • Organometallic Chemistry
  • Uranium Chemistry
  • Redox Chemistry

Background:

  • Alkyl hydride reductive elimination is a well-established reaction pathway for transition metal complexes.
  • This type of reactivity has not been previously documented for f-element compounds, presenting a gap in understanding their reductive capabilities.

Purpose of the Study:

  • To investigate the reductive capabilities of uranium complexes.
  • To explore the potential for alkyl hydride reductive elimination in f-element chemistry.
  • To demonstrate novel multi-electron reduction pathways.

Main Methods:

  • Synthesis and characterization of a U(IV) mixed alkyl hydride complex, (C5Me5)U[mu-C5Me3(CH2)2](mu-H)2U(C5Me5)2.
  • Investigation of the reduction reactions mediated by this complex.
  • Exploration of reactivity with a combination of U(IV) alkyl and hydride complexes.

Main Results:

  • The U(IV) complex effects four, six, and eight-electron reductions, delivering four electrons from hydride and alkyl ligands.
  • The reaction is formally equivalent to an alkyl hydride reductive elimination.
  • A combination of U(IV) alkyl and hydride complexes reduces benzene to a U(III) complex containing a benzene(2-) ligand.

Conclusions:

  • This study demonstrates a novel alkyl hydride reductive elimination pathway for uranium complexes.
  • This finding expands the known reactivity of f-element organometallics.
  • The observed reactivity enables significant multi-electron reductions and the reduction of aromatic hydrocarbons.