Question

Draw the product formed from ring-closing metathesis of each compound.

a.

b.

Short answer

Answer

b.

Step-by-step solution

Metathesis

Transition metal catalysts comprising carbon-metal double bonds are utilized for the metathesis reaction. Several metals, such as ruthenium and tungsten, can be employed for the reaction.

Ring-closing metathesis reactions

Metathesis reactions that result in the creation of rings are termed ring-closing metathesis reactions. Ring-closure occurs when dienes serve as the starting materials.

Products formed from the ring-closing metathesis of each compound

a. The reaction of this particular reactant with the Grubbs catalyst leads to the formation of (benzyloxy)-2-methylpropyl)cyclohex-2-enone as the product. The by-product formed in this reaction is ethene. The reaction can be given as follows.

Reaction of compound a with the Grubbs catalyst1

b. The reaction of reactant b with the Grubbs catalyst leads to the formation of dimethyl-cyclohex-4-ene-1,2-dicarboxylate as the product. The reaction can be given as follows.

Reaction of compound b with the Grubbs catalyst