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Related Concept Videos

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.
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: Anti Dihydroxylation with Peroxy Acids02:04

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 Epoxides03:00

Preparation of Epoxides

Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...

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Related Experiment Video

Updated: May 30, 2026

Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
06:18

Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate

Published on: April 24, 2018

3-Hy-droxy-1,2-dimeth-oxyxanthone.

Hui-Ping Xiong, Zhi-Jun Wu, Fa-Tang Chen

    Acta Crystallographica. Section E, Structure Reports Online
    |August 13, 2011
    PubMed
    Summary

    A novel compound, 3-hydroxy-1,2-dimethoxy-9H-xanthen-9-one, was isolated from Polygala arillata. Its crystal structure reveals planar molecules forming stacks linked by intermolecular hydrogen bonds.

    Area of Science:

    • Natural Product Chemistry
    • Crystallography
    • Medicinal Plant Research

    Background:

    • Polygala arillata is a plant species with potential medicinal properties.
    • Xanthenone derivatives are known for diverse biological activities.
    • Characterization of novel compounds from natural sources is crucial for drug discovery.

    Purpose of the Study:

    • To isolate and characterize a novel compound from Polygala arillata.
    • To determine the crystal structure and intermolecular interactions of the isolated compound.

    Main Methods:

    • Isolation of the compound using chromatographic techniques.
    • Structure elucidation using spectroscopic methods (e.g., NMR, Mass Spectrometry).
    • Single-crystal X-ray diffraction for crystal structure determination.

    Related Experiment Videos

    Last Updated: May 30, 2026

    Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
    06:18

    Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate

    Published on: April 24, 2018

    Main Results:

    • Isolation and identification of 3-hydroxy-1,2-dimethoxy-9H-xanthen-9-one.
    • The tricyclic xanthenone core was found to be essentially planar.
    • Crystal structure analysis revealed molecular stacking along the a axis.
    • Intermolecular O-H⋯O hydrogen bonds were observed, forming chains parallel to [010].

    Conclusions:

    • The study successfully isolated and characterized a new xanthenone derivative from Polygala arillata.
    • The crystal structure provides insights into the solid-state packing and intermolecular interactions.
    • This finding contributes to the understanding of the chemical constituents of Polygala arillata and may guide future research on its pharmacological potential.