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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Phase II Reactions: Methylation Reactions01:17

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Drug Metabolism: Phase II Reactions01:14

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Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...
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Related Experiment Video

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Mitsunobu Reaction: A Versatile Tool for PEG End Functionalization.

Richard d'Arcy1, Nicola Tirelli1,2

  • 1Centre for Injury and Repair, Institute of Inflammation and Repair, University of Manchester, Manchester, M13 9PT, UK.

Macromolecular Rapid Communications
|August 23, 2015
PubMed
Summary
This summary is machine-generated.

The Mitsunobu reaction offers a versatile and efficient method for functionalizing poly(ethylene glycol) (PEG) terminal hydroxyl groups. This approach enables quantitative conversion into various functionalities for PEGylation and bioconjugation without damaging the PEG chain.

Keywords:
Michael-type additionMitsunobu reactionPEGbioconjugationclick reaction

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Bioconjugation Chemistry

Background:

  • Poly(ethylene glycol) (PEG) is widely used in bioconjugation and PEGylation due to its favorable properties.
  • Traditional methods for PEG functionalization can be lengthy and may compromise PEG integrity.
  • There is a need for efficient and mild methods to introduce diverse functionalities onto PEG termini.

Purpose of the Study:

  • To demonstrate the utility of the Mitsunobu reaction for the efficient functionalization of poly(ethylene glycol) (PEG) terminal hydroxyl groups.
  • To showcase the versatility of this method in generating various functional groups amenable to bioconjugation.
  • To propose the Mitsunobu reaction as a general tool for preparing functionalized PEGs for PEGylation and bioconjugation applications.

Main Methods:

  • Utilized the Mitsunobu reaction to transform terminal hydroxyl groups of PEG.
  • Quantitatively converted PEG-OH into azide, aldehyde, amine, thiol, and N-oxymaleimide derivatives.
  • Employed deprotection steps where necessary to reveal desired functionalities for subsequent reactions.

Main Results:

  • Achieved efficient, one-step conversion of PEG terminal OH groups using the Mitsunobu reaction.
  • Demonstrated quantitative yields for various functionalized PEG derivatives, including azides, aldehydes, primary amines, thiols, and N-oxymaleimides.
  • Confirmed the integrity of the PEG backbone throughout the functionalization process, with no observed chain cleavage.

Conclusions:

  • The Mitsunobu reaction is a powerful and efficient tool for the site-specific functionalization of PEG termini.
  • This method provides access to a wide array of functional groups suitable for diverse bioconjugation strategies, including Huisgen cycloaddition and Michael-type addition.
  • The Mitsunobu reaction represents a valuable advancement for preparing functionalized PEGs for applications in PEGylation and broader bioconjugation chemistry.