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Related Concept Videos

Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction mixture.
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
Formation of Halohydrin from Alkenes02:41

Formation of Halohydrin from Alkenes

An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.

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Updated: Jun 1, 2026

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
08:43

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

Published on: January 19, 2016

2-Hydr-oxy-5-nitro-benzaldehyde.

Hasan Tanak, Mustafa Macit, Metin Yavuz

    Acta Crystallographica. Section E, Structure Reports Online
    |May 18, 2011
    PubMed
    Summary
    This summary is machine-generated.

    This study details the molecular and crystal structure of C(7)H(5)NO(4), revealing a nearly planar compound. Intramolecular and intermolecular interactions stabilize the structure, forming specific ring motifs and planar networks interconnected by pi-pi interactions.

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    A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones

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    A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones
    07:30

    A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones

    Published on: January 21, 2020

    Area of Science:

    • Crystallography
    • Molecular Structure
    • Supramolecular Chemistry

    Background:

    • Understanding molecular and crystal structures is fundamental in chemistry.
    • Intermolecular forces dictate the macroscopic properties of materials.

    Purpose of the Study:

    • To elucidate the detailed molecular and crystal structure of the title compound, C(7)H(5)NO(4).
    • To identify and characterize the stabilizing intra- and intermolecular interactions.
    • To describe the resulting supramolecular architecture.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
    • Analysis of bond lengths, bond angles, and deviations from planarity.
    • Identification of hydrogen bonding and pi-pi stacking interactions.

    Main Results:

    • The title compound, C(7)H(5)NO(4), exhibits a nearly planar molecular geometry.
    • An intramolecular hydrogen bond forms a six-membered ring (S(6) motif).
    • Intermolecular C-H⋯O interactions create planar networks with R(2)(2)(8) rings, interconnected by pi-pi interactions (3.582 Å).

    Conclusions:

    • The crystal structure is stabilized by a combination of intramolecular hydrogen bonding and intermolecular C-H⋯O and pi-pi interactions.
    • The compound forms a layered supramolecular network.
    • Detailed structural analysis provides insights into the packing and interactions governing the solid state.