Question - Atactic Polypropylene Is Always Produced With The [cp2zr(r)]+ Catalyst. Explain This On The Basis Of Molecular-level Interactions.
Answer -
There is no preference for the methyl group on propylene to be oriented up or down, because in each case it has exactly the same interaction with a cp group. Since there is no up/down preference, a random (atactic) orientation of methyls along the chain results.