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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

4.7K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.1K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
6.1K
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

4.6K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
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Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

3.9K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
3.9K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.5K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
3.5K
Preparation of Nitriles01:12

Preparation of Nitriles

2.0K
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...
2.0K

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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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Formation of uranium disulfide from a uranium thioamidate single-source precursor.

Sheridon N Kelly1,2, Dominic R Russo1,2, Erik T Ouellette1,2

  • 1Department of Chemistry, University of California Berkeley CA 94720 USA.

Chemical Science
|August 26, 2024
PubMed
Summary

Researchers developed a novel single-source-precursor method to synthesize uranium disulfide (US2) materials. This approach simplifies uranium material synthesis, yielding high-purity US2 without oxygen contamination.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Actinide Chemistry

Background:

  • Uranium-based materials are typically synthesized as oxides.
  • Accessing non-oxide uranium materials, like uranium disulfide (US2), is challenging.
  • Existing methods often require secondary sulfur sources and harsh conditions.

Purpose of the Study:

  • To develop a novel single-source-precursor approach for synthesizing uranium materials beyond oxides.
  • To synthesize uranium disulfide (US2) using a homoleptic uranium thioamidate complex.
  • To demonstrate a method for accessing historically difficult-to-synthesize actinide materials.

Main Methods:

  • Synthesis of a homoleptic uranium thioamidate complex as a single-source precursor.
  • Pyrolysis of the thioamidate complex under controlled conditions.
  • Characterization using simultaneous thermal analysis, elemental analysis, powder X-ray diffraction, and X-ray absorption fine-structure spectroscopy.

Main Results:

  • Successful synthesis of a uranium thioamidate complex.
  • Decomposition of the precursor via alkene elimination pathway.
  • Formation of γ-uranium disulfide (US2) without oxygen contamination, confirmed by multiple analytical techniques.

Conclusions:

  • The single-source-precursor approach is effective for synthesizing uranium disulfide (US2).
  • This method offers shorter reaction times, milder conditions, and better chemical control.
  • This work pioneers the synthesis of non-oxide actinide materials using a single-source precursor strategy.