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His question has multiple parts. work all the parts to get the most points. one method for preparing a nitrile is the dehydration of a primary amide. provide the mechanism for the reaction below: reaction a use curved arrows to show the mechanism of the step below. make the ends of your arrows specify the origin and destination of reorganizing electrons.

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transitionstate
Following reaction shows the preparation of Nitrile from Amide. In this reaction Thionyl chloride is reacted with Amide, which produced nitrile along with SO₂ and HCl gas. The importance of this reaction is the removal of byproducts (i.e SO₂ and HCl). As both SO₂ and HCl are gases so no extra workup is required to remove them. The mechanism of reaction is as follow,
Ver imagen transitionstate