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Preparation of Epoxides

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...

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

Nomenclature of Carboxylic Acid Derivatives: Acid Halides, Esters, and Acid Anhydrides

Nomenclature of Carboxylic Acid Derivatives: Acid Halides, Esters, and Acid Anhydrides

Naming Acid Halides
The IUPAC and common names of acid halides are derived from the corresponding carboxylic acids, by changing “ic acid” to “yl halide.” For example, as shown below, the IUPAC name ethanoyl chloride is derived from ethanoic acid, and the common name, acetyl chloride, is obtained from acetic acid.

Acid Halides to Carboxylic Acids: Hydrolysis

Acid Halides to Carboxylic Acids: Hydrolysis

Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...

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.

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.

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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

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Published on: January 19, 2016

2-(4-Meth-oxy-phen-oxy)acetohydrazide.

Gang Liu¹, Jie Gao

¹College of Food Engineering, Jilin Teachers' Institute of Engineering and Technology, 130052 Changchun, Jilin, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|June 22, 2012

Summary

This summary is machine-generated.

Researchers synthesized a novel compound, C(9)H(12)N(2)O(3), using ethyl 2-(4-methoxy-phenoxy)acetate and hydrazine hydrate. Structural analysis revealed a short N-N bond, indicating electronic delocalization and intermolecular hydrogen bonding in the crystal structure.

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

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Area of Science:

Organic Chemistry
Crystallography
Molecular Structure

Background:

Synthesis of novel organic compounds is crucial for developing new materials and pharmaceuticals.
Understanding molecular interactions, such as hydrogen bonding, is key to predicting material properties.

Purpose of the Study:

To synthesize and characterize the compound C(9)H(12)N(2)O(3).
To investigate the structural features, including bond lengths and intermolecular interactions, of the synthesized compound.

Main Methods:

Chemical synthesis involving the reaction of ethyl 2-(4-methoxy-phenoxy)acetate with hydrazine hydrate in ethanol.
Crystallographic analysis to determine the molecular and crystal structure.

Main Results:

Successful synthesis of the title compound C(9)H(12)N(2)O(3).
Determination of a short N-N bond length (1.413(2) Å) in the acetohydrazide group, suggesting electronic delocalization.
Identification of sheet-like crystal packing facilitated by N-H⋯N and N-H⋯O hydrogen bonds parallel to the ab plane.

Conclusions:

The synthesized compound exhibits interesting structural characteristics, including potential electronic delocalization.
Intermolecular hydrogen bonding plays a significant role in the crystal packing of the compound.