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Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

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One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Preparation of Alkynes: Dehydrohalogenation02:34

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Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
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Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Aryne Multicomponent Reactions by Directed C-H Activation.

Sunil Kumar Sunnam1,2, Jitendra D Belani1

  • 1College of Pharmacy, Thomas Jefferson University, 1020 Locust street, Philadelphia, PA 19107, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 13, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new palladium-catalyzed C-H arylation method using 8-aminoquinoline as a directing group. The novel approach achieves direct arylation and enables sequential C-H functionalization for olefination reactions.

Keywords:
arynebiarylbiarylacrylatemulticomponent reactionsortho C−H activation reactions

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Ortho C-H activation via directing groups is a key area in modern organic synthesis.
  • Previous methods often resulted in cyclization products (isoquinolones) instead of direct arylation.
  • Development of selective C-H functionalization strategies remains a significant challenge.

Purpose of the Study:

  • To develop a novel palladium-catalyzed C-H arylation method.
  • To utilize 8-aminoquinoline as an effective bidentate directing group for regioselective arylation.
  • To explore sequential C-H functionalization for subsequent olefination reactions.

Main Methods:

  • Palladium-catalyzed reaction employing 8-aminoquinoline as a directing group.
  • Utilized aryne precursors for the introduction of aryl groups.
  • Investigated sequential functionalization using methylacrylate and acrylonitrile.

Main Results:

  • Achieved exclusive C-H arylation, avoiding undesired cyclization to isoquinolones.
  • Demonstrated the efficacy of 8-aminoquinoline in directing regioselective C-H arylation.
  • Successfully performed sequential C-H functionalization, leading to C-H olefination.

Conclusions:

  • A new, efficient palladium-catalyzed C-H arylation protocol has been established.
  • The 8-aminoquinoline directing group enables selective arylation and subsequent functionalization.
  • This methodology offers a versatile route for constructing complex organic molecules via sequential C-H activation.