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Related Concept Videos

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Phase I Reactions: Hydrolytic Reactions01:15

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Hydrolysis, a cornerstone of phase I biotransformation reactions, uses water to cleave chemical bonds. This process is pivotal in drug metabolism, generating more polar metabolites that can be easily excreted.
An important hydrolytic reaction is ester hydrolysis. Ester bonds, often found in prodrugs, are broken down, increasing the solubility of drugs like aspirin and lidocaine for more straightforward elimination. Amide hydrolysis is another critical reaction, targeting amide bonds prevalent...
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Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Phase II Reactions: Glucuronidation01:24

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Glucuronidation, a pivotal phase II biotransformation process, involves the coupling of glucuronic acid to a drug or xenobiotic. Given its widespread occurrence and critical role in drug metabolism, it's considered the most crucial phase II reaction. It enhances the water solubility of substances, aiding their expulsion from the body. The driving force behind these reactions is a group of enzymes known as UDP-glucuronosyltransferases (UGTs). UGTs facilitate the transfer of a glucuronic acid...
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Host-guest interaction between herbicide oxadiargyl and hydroxypropyl-β-cyclodextrin.

Sofia Benfeito1, Tiago Rodrigues2, Jorge Garrido1

  • 1Departamento de Engenharia Química, Instituto Superior de Engenharia do Porto (ISEP), Instituto Politécnico do Porto, 4200-072 Porto, Portugal ; CIQ/Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal.

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Scientists developed a new method to improve herbicide solubility and stability using microencapsulation. This technique enhances the effectiveness and safety of pesticides like oxadiargyl (OXA) in water treatment.

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Area of Science:

  • Agricultural Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Rising global population and urbanization increase pesticide demand.
  • Pesticide risks necessitate environmentally sound, effective, and profitable pest control solutions.
  • Novel pesticide formulations can enhance application effectiveness, safety, handling, and storage.

Purpose of the Study:

  • To microencapsulate the herbicide oxadiargyl (OXA) using (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD).
  • To investigate the solubility and complex formation of OXA in aqueous media with HP-β-CD.
  • To determine the stoichiometry of the OXA/HP-β-CD inclusion complex.

Main Methods:

  • Microencapsulation of oxadiargyl (OXA) in (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD).
  • Solubility studies in ultrapure water and various pH buffer solutions.
  • Spectroscopic analysis using UV-Vis and NMR to confirm complex formation and stoichiometry.

Main Results:

  • Oxadiargyl solubility increased with HP-β-CD concentration, indicating inclusion complex formation.
  • UV-Vis and NMR experiments confirmed a 1:1 stoichiometry for the OXA/HP-β-CD complex.
  • The microencapsulation method effectively improved OXA solubility in aqueous environments.

Conclusions:

  • The microencapsulation of oxadiargyl in HP-β-CD is a viable strategy to enhance its properties.
  • This approach offers potential for improved pesticide removal from industrial effluents.
  • The findings contribute to developing safer and more effective pesticide formulations for water treatment applications.