Question

Complete the curved arrow pushing mechanism for the following Michael (conjugate) addition reaction.

Complete the curved arrow pushing mechanism for the following Michael (conjugate) addition reaction.

I can't figure out what I'm doing wrong in the second step. Please help!

Answer 1

Concepts and reason

The reaction of nucleophile (Michael donor) with the ${\rm{\alpha ,}}\,{\rm{\beta }}$ -unsaturated ketone (Michael acceptor) at the alkene site will be resulting in the formation of a new carbon-carbon single bond is called as Michael addition reaction.

Arrow pushing mechanism:

Is a technique to indicate the movement of electrons during the course of the organic reaction.

Fundamentals

Michael addition reaction:

Michael donor: Is an electron rich species, which can donate electrons easily.

Michael acceptor: Is an ${\rm{\alpha ,}}\,{\rm{\beta }}$ -unsaturated ketone, with electron deficient alkene, which can accept electron rich specie (Michael donor).

Michael adduct: The product in which ${\rm{C = C}}$ is converted into ${\rm{C - C}}$ .

Ans:

The complete arrow pushing mechanism for the given Michael conjugated addition reaction is shown below.

Answer 2