, The ADMET procedure is one variation of this reaction which is used to create polymers, and one reagent used to catalyze it contains two cyclopentadiene molecules bound to a four-member ring known as Tebbe's reagent.
, The ADMET procedure is one variation of this reaction which is used to create polymers, and one reagent used to catalyze it contains two cyclopentadiene molecules bound to a four-member ring known as Tebbe's reagent. This [2+2] addition is symmetry-forbidden according to the Woodward- Hoffman rules, but, via the Chauvin mechanism, Grubbs's ruthenium catalyst can overcome that barrier. Schrock carbenes are also used in this reaction, which has a metallocyclobutane intermediate.  The four-member ring breaks in such a way that the R groups on the two reactants switch position.  FTP, name this reaction that switches double bonds from one alkene to another.
, The ADMET procedure is one variation of this reaction which is used to create polymers, and one reagent used to catalyze it contains two cyclopentadiene molecules bound to a four-member ring known as Tebbe's reagent.
{Olefin Metathesis}