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Oxidation of Phenols to Quinones

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...

Structure and Nomenclature of Alcohols and Phenols

Structure and Nomenclature of Alcohols and Phenols

Overview
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds, alcohols and...

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.

Preparation of Diols and Pinacol Rearrangement

Preparation of Diols and Pinacol Rearrangement

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.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
Oxidation reactions are fundamental in aromatic carbon-containing systems. An example is the hydroxylation of phenobarbital, a process that transforms it into...

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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

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Published on: February 16, 2018

Phenolic hydroxylases.

Pirom Chenprakhon¹, Panu Pimviriyakul², Chanakan Tongsook³

¹Institute for Innovative Learning, Mahidol University, Nakhon Pathom, Thailand.

|September 21, 2020

Summary

This summary is machine-generated.

Flavin-dependent phenolic hydroxylases are crucial enzymes for modifying phenolic compounds. Understanding their structures and reaction mechanisms aids in enzyme engineering for biocatalysis.

Keywords:

Flavin-dependent hydroxylases Flavin-dependent monooxygenase Phenolic compounds Phenolic hydroxylases

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Area of Science:

Biochemistry
Enzymology

Background:

Flavin-dependent phenolic hydroxylases (monooxygenases) are well-studied enzymes involved in modifying phenolic compounds.
These enzymes, classified into groups A and D, exist as single-component and two-component systems.
Their ability to insert molecular oxygen is key to altering the properties of phenolic substrates.

Purpose of the Study:

To provide an in-depth discussion of the structural features of single-component and two-component flavin-dependent phenolic hydroxylases.
To detail the reaction mechanisms of representative enzymes like PHBH and HPAH.
To explore enzyme engineering for biocatalytic applications.

Main Methods:

Review of existing literature on flavin-dependent phenolic hydroxylases.
Detailed analysis of structural features and reaction mechanisms.
Discussion of protein engineering strategies for enzyme redesign.

Main Results:

Enzymes within the same group exhibit similar reactions but possess unique structural variations.
These structural differences influence substrate reactivity and the stabilization of key catalytic intermediates like C4a-hydroperoxyflavin.
Protein engineering has demonstrated success in enhancing enzyme capabilities for synthesizing valuable compounds.

Conclusions:

A comprehensive understanding of enzyme structure-function relationships is essential for flavin-dependent phenolic hydroxylases.
This knowledge facilitates enzyme redesign and engineering for advanced biocatalytic applications.
Further research into structural and mechanistic features will drive innovation in enzyme technology.