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Related Concept Videos

Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis02:29

Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
Microbes in Beverage Production01:25

Microbes in Beverage Production

Alcoholic beverages such as wine, beer, and spirits are the products of microbial fermentation processes that transform simple sugars into ethanol and a wide array of complex flavor compounds. These transformations rely on the metabolic activities of specific yeasts and bacteria, which are selected and controlled to yield the desired beverage characteristics.Wine Fermentation and MaturationWine production begins with the crushing of grapes to release juice and pulp, forming a must that is...
Mass Spectrometry: Alcohol Fragmentation01:03

Mass Spectrometry: Alcohol Fragmentation

Alcohols (R-OH) ionize to lose one non-bonded electron from the oxygen atom, forming molecular ions. Due to their tendency to fragment rapidly, the intensity of the molecular ion peak in the mass spectrum is weak or sometimes absent. The fragmentation patterns for alcohols occur in two ways, i.e. ⍺-cleavage and dehydration. During ⍺-cleavage, the bond at the ⍺-position adjacent to the hydroxyl group cleaves to give a resonance-stabilized cation and a radical. However, intramolecular dehydration...
Autoxidation of Ethers to Peroxides and Hydroperoxides02:23

Autoxidation of Ethers to Peroxides and Hydroperoxides

Ethers represent a class of chemical compounds that become more dangerous with prolonged storage because they tend to form explosive peroxides when standing in the air. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly oxidize to form hydroperoxides and dialkyl peroxides.
Protection of Alcohols02:31

Protection of Alcohols

This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...

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Related Experiment Video

Updated: May 23, 2026

Chronic Intermittent Ethanol Vapor Exposure Paired with Two-Bottle Choice to Model Alcohol Use Disorder
05:12

Chronic Intermittent Ethanol Vapor Exposure Paired with Two-Bottle Choice to Model Alcohol Use Disorder

Published on: June 23, 2023

Ethanol isotope method (EIM) for uncovering illegal wine.

I Smajlović1, K L Sparks, J P Sparks

  • 1SG Isotech Inc, 1529 Oakwood Ave, Des Plaines, IL 60016, USA. ivan@sgisotech.com

Natural Product Research
|April 3, 2012
PubMed
Summary

This study introduces a new isotopic method to detect wine adulteration. The technique accurately identifies added water and sugar, ensuring wine authenticity and quality.

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Last Updated: May 23, 2026

Chronic Intermittent Ethanol Vapor Exposure Paired with Two-Bottle Choice to Model Alcohol Use Disorder
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Area of Science:

  • Analytical Chemistry
  • Food Science
  • Organic Chemistry

Background:

  • Isotopic methods are crucial for verifying wine origin and authenticity.
  • Stable isotope ratio analysis aids in detecting fraudulent wine production practices.
  • Isotope ratio mass spectrometry is the standard for measuring stable isotope compositions.

Purpose of the Study:

  • To present a novel isotopic method for analyzing non-exchangeable hydrogen stable isotopes in wine ethanol.
  • To enhance the detection accuracy of adulteration practices in winemaking.
  • To improve the reliability and repeatability of authenticity testing.

Main Methods:

  • Development of a new isotopic method for measuring the deuterium (δD) value.
  • Focus on non-exchangeable hydrogen stable isotopes in ethanol.
  • Utilizing isotope ratio mass spectrometry for precise measurements.

Main Results:

  • The new method offers higher accuracy in detecting water and sugar addition.
  • Demonstrated improved repeatability and reliability in identifying adulteration.
  • Provides a more robust tool for wine authenticity analysis.

Conclusions:

  • The developed isotopic method is effective for investigating wine adulteration.
  • This technique enhances the ability to ensure wine authenticity and prevent fraud.
  • Offers a significant advancement in analytical methods for the wine industry.