91Ó°ÊÓ

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.

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.

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