Stereoblock Isotactic‐Hemiisotactic Poly(propylene)s and Ethylene/Propylene Copolymers Obtained with <i>ansa</i>‐Cyclopenta[1,2‐b;4,3‐b′]dithiophene Catalysts

Abstract

Abstract Summary: Stereoblock, isotactic‐hemiisotactic poly(propylene) is produced with C 1 ‐symmetric Me 2 C( η 5 ‐3‐(2‐adamantyl)‐C 5 H 3 )( η 5 ‐C 9 H 4 S 2 )ZrCl 2 ( 1 ). Ethylene/propylene copolymerization data with the C s ‐symmetric Me 2 C( η 5 ‐C 5 H 4 )( η 5 ‐C 9 H 4 S 2 )ZrCl 2 ( 2 ) metallocene reveals that it is highly propylene‐specific and that it produces more random ethylene/propylene copolymers than its fluorenyl analog. image