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Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

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Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
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Phase I Reactions: Reductive Reactions01:27

Phase I Reactions: Reductive Reactions

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Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Phase II Reactions: Sulfation and Conjugation with α-Amino Acids01:19

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Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme...
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Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Cation-Stacking Approach Enabling Interconversion between Bis(xanthylium) and its Reduced Species.

Moto Kikuchi1, Tomoki Tadokoro1, Takuya Tachibana1

  • 1Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, Hokkaido, 060-0810, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
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Novel cyclophane-type dications featuring xanthylium units exhibit intramolecular π-π stacking, leading to unique optical and redox properties. This cation-stacking approach stabilizes reduced species, offering a new pathway for material design.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Photochemistry

Background:

  • Cyclophane structures enable intramolecular interactions.
  • Xanthylium cations are known for their unique electronic properties.
  • Understanding cation-cation interactions is crucial for designing novel functional materials.

Purpose of the Study:

  • To design and synthesize novel cyclophane-type dications with two xanthylium units.
  • To investigate the impact of intramolecular interactions on optical and redox properties.
  • To explore the stabilization of reduced species through cation stacking.

Main Methods:

  • Stepwise etherification for synthesis of macrocyclic diketone intermediate.
  • X-ray crystallography and UV/Vis spectroscopy for structural and optical analysis.
  • Electrochemical reduction and UV/Vis spectroscopy to study redox behavior and biradical formation.

Main Results:

  • Successful synthesis of cyclophane-type dications.
  • Observation of a stacked structure in both crystal and solution states.
  • Significant blue shift in absorption spectra and a two-stage one-electron reduction process due to π-π stacking.
  • Demonstration of biradical formation upon electrochemical reduction.

Conclusions:

  • Intramolecular cation stacking in cyclophanes induces novel optical and redox properties.
  • The cation-stacking approach effectively perturbs molecular orbitals.
  • This strategy provides a promising route for stabilizing reduced species with open-shell characters.