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Related Concept Videos

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

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Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
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Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

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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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E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

10.5K
SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Sharpless Epoxidation02:57

Sharpless Epoxidation

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The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
4.1K
Acid Halides to Esters: Alcoholysis01:12

Acid Halides to Esters: Alcoholysis

3.0K
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
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Updated: Aug 11, 2025

Light-driven Enzymatic Decarboxylation
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Light-driven Enzymatic Decarboxylation

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Light-accelerated depolymerization catalyzed by Eosin Y.

Valentina Bellotti1,2, Kostas Parkatzidis2, Hyun Suk Wang2

  • 1Department of Material Science, University of Milano-Bicocca Via R. Cozzi 55 20125 Milan Italy.

Polymer Chemistry
|February 10, 2023
PubMed
Summary
This summary is machine-generated.

Light-activated depolymerization using Eosin Y accelerates monomer recovery from polymers. This method enhances polymer recyclability at lower temperatures compared to traditional thermal methods.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Recyclability of polymers is crucial for sustainability.
  • Current depolymerization methods often require high temperatures (120-180 °C).
  • Reversible deactivation radical polymerization (RDRP) enables polymer synthesis with controlled structures.

Purpose of the Study:

  • To investigate light-induced depolymerization of RDRP-synthesized polymers at lower temperatures.
  • To enhance the efficiency and speed of monomer recovery for improved polymer recyclability.

Main Methods:

  • Utilizing Eosin Y as a photocatalyst under visible light irradiation.
  • Employing reversible addition-fragmentation chain-transfer (RAFT) polymerization for polymer synthesis.
  • Analyzing depolymerization extent using 1H-NMR and Size Exclusion Chromatography (SEC).

Main Results:

  • Eosin Y and light irradiation significantly accelerated depolymerization of poly(methyl methacrylate) at 100 °C.
  • Depolymerization increased from 16% (thermal) to 80% within 8 hours under green light.
  • The enhanced rate is attributed to light-activated macro-chain transfer agent (macroCTA) by Eosin Y, facilitating macroradical generation.

Conclusions:

  • Photocatalytic depolymerization with Eosin Y offers a faster and more energy-efficient alternative to thermal methods.
  • This light-mediated approach is versatile, compatible with various light wavelengths, solvents, and RAFT agents.
  • The method holds significant potential for improving industrial-scale polymer recycling and circular economy initiatives.