High School

Assume the phenyl Grignard reagent is successfully formed in the reaction vessel. What directly forms from this Grignard reagent under the following conditions?

1. An ethereal solution of benzophenone is added.

2. An ethereal solution of benzophenone is added that is "wet" with water.

3. An ethereal solution of benzophenone is added from an addition funnel that was generously rinsed with copious amounts of acetone before adding the ethereal benzophenone to the Grignard reagent solution.

Answer :

When an ethereal solution of benzophenone is added to the phenyl Grignard reagent, it forms a new compound called diphenylmethanol.

When a wet ethereal solution of benzophenone is added, the reaction may not proceed smoothly as water can hydrolyze the Grignard reagent and it from reacting with benzophenone. When an ethereal solution of benzophenone is added from an addition funnel that was rinsed with acetone, it ensures that there are no impurities that may interfere with the reaction and lead to side products.

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