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Aldehydes and Ketones with Water: Hydrate Formation01:20

Aldehydes and Ketones with Water: Hydrate Formation

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An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
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In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
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Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation00:43

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As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.
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Dehydration of Aldols to Enals: Base-Catalyzed Aldol Condensation01:14

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This lesson delves into the aldol condensation catalyzed by bases, where aldols undergo dehydration to enals. As shown in Figure 1, the β-hydroxy aldehyde formed in a base-catalyzed aldol addition reaction dehydrates on heating to yield an unsaturated carbonyl product, which is commonly referred to as an enal.
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Preparation of Diols and Pinacol Rearrangement01:57

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Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
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Dehydration Synthesis01:15

Dehydration Synthesis

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Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
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Deoxydehydration of polyols.

Camille Boucher-Jacobs1, Kenneth M Nicholas

  • 1Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK, 73019, USA.

Topics in Current Chemistry
|April 24, 2014
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Summary
This summary is machine-generated.

Deoxydehydration (DODH) converts glycols to olefins, a key step for biomass conversion. Recent advances include non-precious metal catalysts, improving sustainable chemical synthesis.

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Area of Science:

  • Sustainable Chemistry
  • Catalysis
  • Biomass Conversion

Background:

  • Efficient partial oxygen removal is crucial for converting oxygenated biomass feedstocks into valuable chemical products.
  • The deoxydehydration (DODH) reaction offers a pathway to convert vicinal diols (glycols) into olefins.
  • Early methods involved uncatalyzed deoxygenative eliminations.

Purpose of the Study:

  • To review the development of the deoxydehydration (DODH) reaction.
  • To highlight advancements in catalyzed DODH reactions and their mechanistic understanding.
  • To discuss recent progress in practical DODH catalysis using non-precious metals.

Main Methods:

  • Review of existing literature on deoxydehydration reactions.
  • Analysis of catalytic systems, including oxo-rhenium catalysts and various reductants.
  • Examination of mechanistic studies, selectivity observations, and computational analyses.
  • Discussion of recent developments in vanadium- and molybdenum-based DODH catalysis.

Main Results:

  • Catalyzed DODH reactions primarily utilize oxo-rhenium catalysts with reductants like phosphines, dihydrogen, sulfite, and alcohols.
  • A wide range of glycol and biomass-derived polyol substrates can be converted with moderate to good efficiency, regioselectivity, and stereoselectivity.
  • Mechanistic studies suggest a three-stage process: glycol condensation, metal reduction, and alkene extrusion.
  • The discovery of non-precious vanadium- and molybdenum-oxo catalysts represents a significant practical advancement.

Conclusions:

  • Deoxydehydration is an effective reaction for converting glycols to olefins, with significant potential in biomass valorization.
  • Catalytic systems, particularly those employing oxo-rhenium, have been extensively studied and optimized.
  • Recent developments in non-precious metal catalysis offer more sustainable and cost-effective routes for DODH.
  • Further research into DODH catalysis can lead to more efficient and selective biomass conversion processes.