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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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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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Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

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Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
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This lesson delves into the conversion of alcohols to corresponding alkyl halides and the mechanism of action for different reagents. Typically, the hydroxyl group is first protonated to convert it to a stable leaving group. Consequently, based on the starting alcohol, the mechanism undergoes either of the nucleophilic substitution routes, SN1 or SN2. Tertiary alkyl halides are made using the two-step SN1 mechanism that occurs via a carbocation intermediate, which is stabilized by...
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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.
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Unlike aldehydes and ketones, carboxylic acids do not readily participate in α halogenation reactions via enols or enolate intermediates. However, α-halogenated acids are obtained through other methods. One of the approaches is the Hell–Volhard–Zelinsky (HVZ) reaction, wherein the carboxylic acid is treated with halogen in the presence of PBr3. It involves the conversion of acid to acid halide, which exists in equilibrium with its enol form. The enol attacks the...
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Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
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Thioetherification of Aryl Halides with Thioacetates.

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The Journal of Organic Chemistry
|May 17, 2022
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A novel palladium-catalyzed cross-coupling reaction efficiently synthesizes thioarenes from thioacetates and aryl halides. This method utilizes a unique catalyst, offering a mild and accessible route to valuable sulfur-containing compounds.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Sulfur Chemistry

Background:

  • Palladium-catalyzed cross-coupling reactions are fundamental in organic synthesis.
  • Efficient methods for synthesizing thioarenes and performing thiomethylation are highly sought after.
  • Traditional methods may require harsh conditions or less accessible reagents.

Purpose of the Study:

  • To develop a mild and efficient palladium-catalyzed cross-coupling method for thioacetates and aryl halides.
  • To identify a unique catalyst system for this transformation.
  • To demonstrate the utility of the method for late-stage functionalization and thiomethylation.

Main Methods:

  • Screening of palladium catalysts and ligands using a catalyst screening kit.
  • Optimization of reaction conditions, including temperature and solvent.
  • Application of the developed method to various thioacetates and aryl halides, including complex substrates.

Main Results:

  • Identification of 4,4'-Di-tert-butyl-1,1'-biphenyl-2,2'-diylbis(di-tert-butylphosphine) palladium(II) dichloride precatalyst ( (tBu)2BrettPhos Pd G3 ) as a unique catalyst.
  • High yields of thioarene products obtained under mild reaction conditions.
  • Demonstration of late-stage coupling with complex thioacetates and successful thiomethylation of aryl halides.

Conclusions:

  • A novel and efficient palladium-catalyzed cross-coupling of thioacetates and aryl halides has been established.
  • The developed method provides mild reaction conditions and utilizes readily available starting materials.
  • This work offers a valuable new tool for the synthesis of thioarenes and thiomethylation of aryl halides.