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Related Concept Videos

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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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Preparation of Epoxides

Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
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Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Published on: June 21, 2017

N-Triflylation Enables δ-Valerolactam-Epoxide Alternating Copolymerization.

Tao Lai1, Shuotong Wang1, Junpeng Zhao1,2

  • 1Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.

ACS Macro Letters
|April 27, 2025
PubMed
Summary
This summary is machine-generated.

Researchers activated δ-valerolactam (VL) for copolymerization with epoxides using N-triflylation. This method yields alternating poly(ester-sulfonamide) polymers with tunable properties and good degradability.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • δ-Valerolactam (VL), a six-membered cyclic amide, is typically difficult to polymerize.
  • Existing polymerization methods for cyclic amides have limitations in scope and control.

Purpose of the Study:

  • To develop a novel method for activating and polymerizing δ-valerolactam (VL).
  • To synthesize strictly alternating copolymers of VL and epoxides.
  • To explore the properties and potential applications of the resulting polymers.

Main Methods:

  • Activation of δ-valerolactam (VL) via N-triflylation.
  • Ring-opening alternating copolymerization with various epoxides.
  • Catalysis using mild organobases, triethyl borane, and an alcohol initiator at room temperature.

Main Results:

  • Successfully achieved copolymerization of activated VL with diverse epoxides.
  • Produced strictly alternating poly(ester-sulfonamide)s with controlled molar mass and low dispersity.
  • Demonstrated good chemical degradability, thermal/enzymatic stability, and tunable glass transition temperatures in the synthesized polymers.

Conclusions:

  • N-triflylation is an effective strategy to activate conventionally non-polymerizable δ-valerolactam (VL).
  • The developed ring-opening alternating copolymerization offers a versatile platform for creating novel heteroatom-rich polymers.
  • This approach enables the design of advanced materials with tailored properties from readily accessible monomers.