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Mechanism. The following Grignard reaction has been observed to yield products A and B. MeV Mgci OH ol temple THF, -70 °C Me

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Answer #1

Part A mechanism:

In this mechanism, the carbanion of Grignard reagent attacks at the carbon of carbonyl group and forms its magnesium salt. This salt is converted into respective alcohol in acidic work up. The mechanism is shown below:

Part B mechanism:

In this mechanism, the carbanion of Grignard reagent attacks at the carbon of carbonyl group in michael fashion (reaction of conjugated carbanion) and forms its magnesium salt. This salt is converted into respective alcohol in acidic work up. The mechanism is shown below:

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