Reaction of thiols with vinyl ethers

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Discussion Overview

The discussion revolves around the reaction of thiols with vinyl ethers, specifically focusing on the mechanism of the reaction and the conditions under which it occurs. Participants explore the implications of anti-Markovnikov's rule and the nature of the reaction mechanism.

Discussion Character

  • Homework-related
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant states that thiols react with vinyl ethers according to anti-Markovnikov's rule and suggests that the reaction follows a free radical mechanism, referencing Jerry March's book.
  • Another participant proposes that the interaction between the oxygen in vinyl ether and the hydrogen in thiol activates the double bond, leading to the formation of the anti-Markovnikov product through a series of bond changes.
  • Some participants emphasize that the reaction follows a free radical mechanism, questioning the conditions under which this mechanism can occur without a free radical initiator.
  • Concerns are raised about the lack of information regarding the initiation of the free radical mechanism, particularly in the absence of energy sources like UV rays.
  • It is noted that the reaction occurs under catalyst and solvent-free conditions, which adds to the complexity of understanding the mechanism.

Areas of Agreement / Disagreement

Participants express disagreement regarding the mechanism of the reaction, particularly whether it can be classified as a free radical mechanism without additional energy input. The discussion remains unresolved as multiple viewpoints are presented without consensus.

Contextual Notes

Participants highlight limitations in the provided information, such as the absence of details on the initiation of the free radical mechanism and the implications of conducting the reaction in catalyst-free conditions.

AdityaDev
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Homework Statement


Find the product:
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2. Relevant concepts

Thiols react with vinyl ethers according to anti-markovnikov's rule

The Attempt at a Solution



After reading Jerry March's book, i came to know that it follows free radical mechanism and that is why it gives anti markovnikov's product. Just like the peroxide effect. But its given that the reaction takes place in catalyst free conditions. What is the free radical initiator here?
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The interaction between oxygen in vinyl ether and hydrogen in thiol activates the double bond. The beta carbon has a partial positive charge and attracts sulfur. Then the bond between sulfur and hydrogen is broken. The alpha carbon then abstracts the proton from oxygen, giving the anti-Markovnikov product.
 
But it follows free radical mechanism.
 
AdityaDev said:
But it follows free radical mechanism.
Are you sure?
There must be given something else in your book?
Initiation of free radical mechanism requires energy in form of UV rays or something else but here nothing more is given.
 
Nothing else is given. Surprisingly, the reaction takes place in catalyst and solvent free conditions.
 

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