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Chapter 22: Q55P (page 1193)

Propose a mechanism for the conjugate addition of a nucleophile (Nuc:-) to acrylonitrile (H2C=CHCN) and to nitroethylene. Use resonance forms to show how the cyano and nitro groups activate the double bond toward conjugate addition.

Short Answer

Expert verified

Conjugate addition of a nucleophile to the double bond of acrylonitrile 伪,尾-unsaturated compound is called a Michael addition.

The electrophile acrylonitrile accepts a pair of electrons, so it is called the Michael acceptor. The attacking nucleophile donates a pair of electrons, so it is called the Michael donor.

Conjugate addition of nucleophile to acrylonitrile is shown as follows:

Conjugate addition of nucleophile to acrylonitrile

Step by step solution

01

Conjugate addition of nucleophile to acrylonitrile

Conjugate addition of a nucleophile to the double bond of acrylonitrile 伪,尾-unsaturated compound is called a Michael addition.

The electrophile acrylonitrile accepts a pair of electrons, so it is called the Michael acceptor. The attacking nucleophile donates a pair of electrons, so it is called the Michael donor.

Conjugate addition of nucleophile to acrylonitrile is shown as follows:

Conjugate addition of nucleophile to acrylonitrile

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