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Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

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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...
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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...
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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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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
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Ladder Diagrams: Complexation Equilibria01:07

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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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KNH2-KH: a metal amide-hydride solid solution.

Antonio Santoru1, Claudio Pistidda2, Magnus H Sørby3

  • 1Nanotechnology Department, Helmholtz-Zentrum Geesthacht Max-Planck Straße 1, 21502, Geesthacht, Germany. antonio.santoru@hzg.de and Department of Chemistry and NIS centre, University of Torino, V. Giuria 7, 10125, Torino, Italy.

Chemical Communications (Cambridge, England)
|October 11, 2016
PubMed
Summary
This summary is machine-generated.

Researchers created a novel metal amide-hydride solid solution by dissolving potassium hydride (KH) into potassium amide (KNH2). This innovation preserves high-temperature properties of KNH2 at room temperature, opening new material possibilities.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Inorganic chemistry

Background:

  • Potassium amide (KNH2) exhibits interesting high-temperature properties, including rotational dynamics of the amide anion.
  • Understanding and stabilizing these properties at lower temperatures is crucial for potential applications.

Purpose of the Study:

  • To synthesize and characterize a new metal amide-hydride solid solution.
  • To investigate the effect of hydride incorporation on the structural and dynamic properties of potassium amide.

Main Methods:

  • Synthesis of a solid solution by dissolving potassium hydride (KH) into potassium amide (KNH2).
  • Characterization techniques likely included X-ray diffraction (XRD) and spectroscopic methods to confirm the solid solution formation and structure.
  • Analysis of anionic substitution and its impact on ion interactions.

Main Results:

  • Successful formation of a metal amide-hydride solid solution for the first time.
  • Observed anionic substitution of hydride (H-) for amide (NH2-) ions.
  • Demonstrated a decrease in NH2- ion interactions within the solid solution.

Conclusions:

  • The formation of the metal amide-hydride solid solution effectively suppresses the strong interactions between NH2- ions.
  • The rotational properties characteristic of high-temperature KNH2 polymorphs are retained down to room temperature in the solid solution.
  • This work presents a new pathway for stabilizing dynamic properties of ionic materials at ambient conditions.