Britzinger showed that chiral ansa-indenyl ligands can help direct the action of these compounds, and these compounds use MgCl2 or SiO2 as a support. Using vanadium instead of the usual central atom reverses the stereochemistry of the product, and metallocenes are sometimes used to improve control of the product distributio
Britzinger showed that chiral ansa-indenyl ligands can help direct the action of these compounds, and these compounds use MgCl2 or SiO2 as a support. Using vanadium instead of the usual central atom reverses the stereochemistry of the product, and metallocenes are sometimes used to improve control of the product distribution. The less-accepted Green-Mooney mechanism for their operation has a hydride shift, while a competing theory has a substrate occupy a vacant site in the coordination sphere of the central metal atom, followed by a migration. This results in repeated 1,2-insertions and is known as the Cosee-Arleman mechanism, which produces either iso or syndiotactic products. Usually terminating via beta-hydride elimination, for 10 points, name these aluminum and titanium chloride compounds used to create polyethylenes, a type of catalyst named for two chemists.
Britzinger showed that chiral ansa-indenyl ligands can help direct the action of these compounds, and these compounds use MgCl2 or SiO2 as a support.
{Ziegler-Natta} catalysts