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Related Concept Videos

Preparation of Diols and Pinacol Rearrangement01:57

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 Tetraoxide02:44

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.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids01:24

Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids

Although it is possible to reduce a carboxylic acid to an aldehyde, strong reducing agents, like lithium aluminum hydride (LAH), prohibit a controlled reduction, instead causing the generated aldehyde to instantly over-reduce to a primary alcohol.
Reducing carboxylic acid derivatives like acyl chlorides (RCOCl), esters (RCO2R′), and nitriles (RCN) using milder aluminum hydride agents like lithium tri-tert-butoxyaluminum hydride [LiAlH(O-t-Bu)3] and diisobutylaluminum hydride [DIBAL-H] allows...
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

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Related Experiment Video

Updated: May 9, 2026

Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography
10:14

Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography

Published on: May 16, 2014

New ionic liquid-based preparative method for diosgenin from Rhizoma dioscoreae nipponicae.

Wang Yan1, Luo Ji, Song Hang

  • 1Department of Pharmaceutical and Biological Engineering, Sichuan University, Chengdu, China.

Pharmacognosy Magazine
|August 10, 2013
PubMed
Summary

This study introduces a novel, green method for extracting diosgenin from Rhizoma dioscoreae nipponicae using an ionic liquid. The one-step process is efficient and the ionic liquid is reusable, offering a promising alternative to traditional extraction techniques.

Keywords:
Diosgeninextractionhydrolysisionic liquid

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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Published on: November 27, 2015

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Last Updated: May 9, 2026

Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography
10:14

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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
06:31

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Published on: November 27, 2015

Area of Science:

  • Phytochemistry
  • Green Chemistry
  • Chemical Engineering

Background:

  • Rhizoma dioscoreae nipponicae, a herb used in Traditional Chinese Medicine (TCM), contains valuable compounds.
  • Diosgenin, derived from dioscin, is a crucial precursor in pharmaceutical synthesis.

Purpose of the Study:

  • To develop and optimize a one-step extraction and hydrolysis method for diosgenin from Rhizoma dioscoreae nipponicae.
  • To utilize a functional ionic liquid as a green alternative to traditional inorganic acids.

Main Methods:

  • Employed a novel ionic liquid, 1-methyl-3-(3-sulfopropyl)-imidazolium hydrogen sulfate ([PSMIM]HSO4), for ultrasonic extraction and hydrolysis.
  • Evaluated various factors influencing the extraction process.
  • Analyzed the product using High Performance Liquid Chromatography (HPLC).

Main Results:

  • Achieved an yield of 6.35 mg of diosgenin per 2.0 g of raw material.
  • Demonstrated the reusability of the ionic liquid over four cycles with only a 5% decrease in extraction efficiency.
  • Validated the efficiency and sustainability of the developed method.

Conclusions:

  • The one-step extraction method using [PSMIM]HSO4 offers significant advantages as a green and catalytic solvent.
  • This novel approach shows potential to replace conventional diosgenin preparation methods.
  • Further research is warranted to fully explore its applicability in the pharmaceutical industry.