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Related Concept Videos

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.
Antidotes01:17

Antidotes

Antidotes are medicinal substances used to counteract the harmful effects of toxins or drugs in the body. They function in various ways, each uniquely designed to combat specific toxic compounds.
Specific antidotes operate by inhibiting the enzymes that control biochemical pathways, reducing the production of harmful metabolites.
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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...
Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
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Determining the pH of Salt Solutions04:08

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The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...

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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
09:44

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

A caged cyanide.

Markus Knipp1, Johanna J Taing, Chunmao He

  • 1Max-Planck-Institut für Bioanorganische Chemie, Stifstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany. mknipp@mpi-muelheim.mpg.de

Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology
|March 13, 2012
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a photoactivatable caged cyanide (NPE cyanide) that releases cyanide upon UV light exposure. This compound successfully induced the formation of a cyanide-heme complex in the nitrophorin 4 protein.

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Area of Science:

  • Biochemistry
  • Photochemistry
  • Chemical Biology

Background:

  • Nitrophorin 4 is a heme protein from Rhodnius prolixus.
  • Cyanide binding to heme proteins is of significant biological interest.
  • Controlled release of small molecules is a key challenge in chemical biology.

Purpose of the Study:

  • To synthesize a photoactivatable caged cyanide.
  • To demonstrate the utility of this caged cyanide in biological systems.
  • To investigate cyanide incorporation into heme proteins.

Main Methods:

  • Synthesis of 1-(2-nitrophenyl)ethyl (NPE) cyanide.
  • Photochemical uncaging using near-UV irradiation.
  • Spectroscopic analysis of heme protein complex formation.

Main Results:

  • Successful synthesis of NPE cyanide.
  • Demonstration of cyanide release upon photoactivation.
  • Induction of Fe(III)-CN(-) complex formation in nitrophorin 4.

Conclusions:

  • NPE cyanide is a viable photoactivatable tool for cyanide delivery.
  • This method allows for controlled formation of cyanide-heme complexes.
  • The study provides a novel approach for studying heme protein interactions.