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Chapter 24: Q.42. (page 962)

Question:Draw the product formed from a Michael reaction with the given starting materials usingOEt,EtOH.

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01

Michael reaction

The Michael reaction is a 1,4-addition reaction involving an enolate and an α,β-unsaturated carbonyl system.

The enolates act as the nucleophiles, and theα,β-unsaturated carbonyl system is known as the Michael acceptor.

02

Mechanism of Michael reaction

The general reaction is given below.

Michael reaction

The mechanism of the reaction is given below.

Mechanism of Michael reaction

03

Determination of products

The Michael acceptor and nucleophilic source are marked, and the product of each reaction is given below.

a.

Michael addition of a

b.

Michael addition of b

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Most popular questions from this chapter

Question: Draw the product formed from an aldol reaction with the given starting material(s) using OH,H2O.
  1. Question:β -Vetivone is isolated from vetiver, a perennial grass that yields a variety of compounds usedin traditional eastern medicine, pest control, and fragrance. In one synthesis, ketone A is converted to β-vetivone by a two-step process: Michael reaction, followed by intramolecular 00a00000ldol reaction.000 (a) What Michael acceptor is needed for the conjugate addition? (See Problem23.61 for another method to form the bicyclic ring system of β-vetivone.) (b) Draw a stepwise mechanism for the aldol reaction, which forms the six-membered ring.

Question: Draw the product of each Robinson annulation from the given starting materials using OHin H2Osolution.

Question: Draw the products when each pair of compounds is treated with CH3CH2O-,CH3CH2OH in a Robinson annulation reaction.

Question: What starting materials are needed to synthesize each compound by a Robinson annulation?
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