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Related Concept Videos

Dehydration of Aldols to Enals: Base-Catalyzed Aldol Condensation01:14

Dehydration of Aldols to Enals: Base-Catalyzed Aldol Condensation

7.2K
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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Dehydration Synthesis01:15

Dehydration Synthesis

150.8K
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
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...
150.8K
Aldehydes and Ketones with Water: Hydrate Formation01:20

Aldehydes and Ketones with Water: Hydrate Formation

5.0K
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,...
5.0K
Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation00:43

Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation

3.1K
As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.
3.1K
Acid-Catalyzed Dehydration of Alcohols to Alkenes02:35

Acid-Catalyzed Dehydration of Alcohols to Alkenes

24.3K
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.
24.3K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

9.7K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
9.7K

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Purification of the Sarco-Endoplasmic Reticulum Ca2+-ATPase from Rabbit Muscle
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(De)hydratases-recent developments and future perspectives.

Rebecca M Demming1, Max-Philipp Fischer1, Jens Schmid1

  • 1Institute of Biochemistry and Technical Biochemistry, Universitaet Stuttgart, Allmandring 31, 70569 Stuttgart, Germany.

Current Opinion in Chemical Biology
|November 21, 2017
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Summary
This summary is machine-generated.

Cofactor-independent hydratases offer selective catalysis, replacing chemical catalysts. This review highlights recent advances in their mechanisms, structures, and applications in organic synthesis.

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Area of Science:

  • Biocatalysis
  • Enzyme Engineering
  • Organic Chemistry

Background:

  • Hydratases are enzymes that catalyze the addition or removal of water.
  • Cofactor-independent hydratases are gaining attention for industrial applications due to their selectivity.
  • These enzymes offer advantages over traditional chemical catalysts.

Purpose of the Study:

  • To review recent findings on hydratases, focusing on cofactor-independent enzymes.
  • To explore mechanistic and structural aspects of hydratases.
  • To discuss the expansion of substrate scope and new applications in organic synthesis.

Main Methods:

  • Literature review of recent studies on hydratases.
  • Analysis of substrate scope, mutagenesis, crystal structures, and bioinformatics.
  • Focus on fatty acid hydratases, linalool dehydratase isomerase, and carotenoid hydratases.

Main Results:

  • Hydratases exhibit high regio-, stereo-, and enantioselectivity.
  • Cofactor-independent hydratases are particularly promising for industrial use.
  • Recent research has elucidated mechanistic and structural details, expanding substrate scope.

Conclusions:

  • Hydratases represent a valuable class of biocatalysts with significant potential in organic synthesis.
  • Further research into their mechanisms and structures will unlock new applications.
  • Cofactor-independent hydratases are key targets for developing sustainable catalytic processes.