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Acid Halides to Alcohols: Grignard Reaction01:15

Acid Halides to Alcohols: Grignard Reaction

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Organomagnesium halides, commonly known as Grignard reagents, convert acid halides to tertiary alcohols. The reaction requires two equivalents of the Grignard reagent and proceeds via a ketone intermediate.
Grignard reagents are a source of carbanions and function as nucleophiles. The mechanism begins with the nucleophilic attack by the carbanion at the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs,...
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The reaction of an ester with a Grignard reagent, followed by hydrolysis of the magnesium alkoxide salt in aqueous acid, yields a tertiary alcohol. In the case of formate esters, secondary alcohols are formed.
The reaction requires two equivalents of the Grignard reagent and introduces two identical alkyl groups, derived from the Grignard reagent, bonded to the hydroxyl-bearing carbon of the alcohol.
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Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
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Alcohols from Carbonyl Compounds: Grignard Reaction02:00

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Grignard reagents are one of the most commonly used reagents used to synthesize alcohols from carbonyl compounds. Grignard reagents are organomagnesium halides with a highly polar carbon–magnesium bond. Due to the partial ionic nature of the C–Mg bond, the carbon functions as a strong nucleophile and attacks electrophiles like carbonyl carbon.
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Organomagnesium halides, commonly known as Grignard reagents, convert nitriles to ketones and proceed through a nucleophilic acyl substitution. Nitriles react with a Grignard reagent, followed by an aqueous acid, to yield ketones. The reaction introduces a new carbon–carbon bond. The alkyl–magnesium bond in the Grignard reagent is highly polar, so the alkyl carbon develops a carbanionic character and acts as a nucleophile.
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The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
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Pd-catalyzed allylative dearomatisation using Grignard reagents.

Cosimo Boldrini1, Syuzanna R Harutyunyan1

  • 1Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, Groningen, 9747 AG, The Netherlands. s.harutyunyan@rug.nl.

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Summary

This study demonstrates palladium-catalyzed allylative dearomatisation of naphthyl halides using Grignard reagents. This efficient method achieves fast reactions and broad scope with low catalyst loading.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Naphthyl halides are important synthetic intermediates.
  • Dearomatisation reactions offer novel pathways to complex molecules.
  • Palladium catalysis is a powerful tool in organic synthesis.

Purpose of the Study:

  • To develop a novel palladium-catalyzed method for the dearomatisation of naphthyl halides.
  • To explore the use of Grignard reagents as nucleophiles in this transformation.
  • To demonstrate the broad scope and efficiency of the developed methodology.

Main Methods:

  • Palladium-catalyzed reaction of naphthyl halides with Grignard reagents.
  • Optimization of reaction conditions including catalyst loading and temperature.
  • Synthesis and characterization of various substituted naphthyl compounds.

Main Results:

  • Successful palladium-catalyzed allylative dearomatisation of naphthyl halides was achieved.
  • High reactivity of Grignard reagents enabled fast reactions and low catalyst loading.
  • A broad scope of substituted compounds was synthesized, including five-membered heteroaromatic systems.

Conclusions:

  • The developed method provides an efficient route to dearomatised naphthyl compounds.
  • The use of Grignard reagents offers a practical approach for this transformation.
  • The methodology is applicable to both carbocyclic and heteroaromatic systems.