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Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

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Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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Carboxylic acids, upon reaction with strong reducing agents such as lithium aluminum hydride followed by hydrolysis, undergo reduction to form primary alcohols.
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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
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Cation recognition controlled by protonation or chemical reduction: a computational study.

Renato Pereira Orenha1,2, Alexandre Borges3,4, Ana Lívia de Oliveira Andrade2

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This summary is machine-generated.

Carboxylic acid crown ethers show superior cation recognition compared to ferrocene derivatives. Structural modifications, like adding electron-donating groups, enhance binding affinity for smaller cations, optimizing molecular recognition.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Non-covalent interactions involving cations are crucial for controlling biochemical processes.
  • Cation recognition by synthetic receptors is vital for applications in sensing and separation.
  • Crown ethers are established scaffolds for cation binding, but their performance can be tuned.

Purpose of the Study:

  • To elucidate and tune the cation binding interactions of carboxylic acid- and ferrocene-functionalized crown ether derivatives.
  • To investigate the impact of electron donor (-NH2) and acceptor (-NO2) group substitutions on cation recognition.
  • To compare the cation recognition capabilities of carboxylic acid versus ferrocene-based crown ether systems.

Main Methods:

  • Synthesis of functionalized crown ether derivatives (carboxylic acid and ferrocene-based).
  • Computational studies to analyze bonding situations and electrostatic interactions.
  • Systematic variation of substituents to tune electronic properties and steric effects.

Main Results:

  • Deprotonation of carboxyl groups significantly enhances cation binding via electrostatic interactions.
  • Ferrocene derivatives show improved cation recognition with reduced iron-cation repulsion.
  • Receptors preferentially bind smaller cations (Li+, Na+, K+) due to favorable electrostatic and orbital interactions.
  • Electron-donating/accepting groups on carboxylic acid derivatives modulated interactions, with electron donors generally decreasing affinity.
  • Substitution of -H with -NH2 in ferrocene enhanced recognition through strengthened electrostatic and sigma bonds.
  • Carboxylic acid derivatives exhibited superior cation interaction over ferrocene compounds due to electron density and lack of repulsive interactions.

Conclusions:

  • Structural modifications of crown ether derivatives offer a powerful strategy to tune cation recognition.
  • Carboxylic acid-functionalized crown ethers demonstrate greater potential for cation recognition applications than ferrocene derivatives.
  • Understanding structure-property relationships is key to designing advanced molecular receptors for specific cations.