Formation of cyclopropane in the reaction of the components of complex metathesis catalyst

1. Cyclopropane (the product from the reaction of the carbene with the olefin) is formed in the reaction of the components of the metathesis catalyst having the composition MoCl3(C17H35COO)2-Al(C2H5)2Cl. 2. Cyclopropane is not formed in the presence of cyclopentene and vinyltrimethylsilane, which trap the carbene active centers.