Copolymerization of propene and 1-hexene has been carried out in toluene at 30C in the presence of homogeneous methylaluminoxane (MAO)-activated 3 ansa-metallocenes, highly syndiospecific iPr(Cp)(Flu)ZrMe2 (1), lower syndiospecific Et(Cp)(Flu)ZrMe2 (2), and isospecific rac-(EBTHI)ZrMe2 (3), in order to study the role of catalyst stereospecificity on comonomer incorporation. The incorporation of 1-hexene decreases in the following order: highly syndiospecific 1/MAO catalyst lower syndiospecific 2/MAO catalyst isospecific 3/MAO catalyst. All copolymer chains contain the comonomer in nearly random distribution. The copolymers produced by 1/MAO and 3/MAO catalysts were composed of uniform chains, but that by 2/MAO was fractionated into many fractions in the solvent extraction. Considerable rate enhancements were recorded in the copolymerization when the feed ratio of 1-hexene to propene is around 0.6 for all catalysts.