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Question

Explain how alcohols react with phosphorus trihalides


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Solution

The reaction of alcohol with Phosphorus trihalides:

  • The reaction of Alcohol with Phosphorous trihalides takes place by the SN1 mechanism.
  • In the first step, the alcohol group(-OH) leaves the carbon-alcohol bond because of the polarity in the bond. thus forming carbocation intermediate.

  • After the formation of carbocation, the nucleophile from Phosphorous trichloride attacks the carbocation and facilitates the formation of alkyl halides.

  • The same will be the reaction with Bromide and Iodide.

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