CORRECTIONS

Andrew Carvill, Incoronata Tritto, Paolo Loca-telli, and Maria Carmela Sacchi*: Polymer Micro-structure as a Probe into Hydrogen Activation Effectin ansa-Zirconocene/Methylaluminoxane Catalyzed Pro-pene Polymerizations. Volume 30, Number 23, Novem-ber 17, 1997, pp 7056-7062.

During the period in which the paper was preparedfor publication we have realized that the proton NMRassignment (according to refs 10 and 29) of the tripletcentered at 5.10 ppm to the isobutenyl end group is notcorrect. In fact, in a recent paper (Dolatkhani, M.;Cramail, H.; Deffieux, A.Macromol. Chem. Phys. 1995,196, 3091), the isobutenyl group belonging to themonomer 5,7-dimethylocta-1,6-diene in the copolymerwith ethylene is detected as a doublet at a field slightlyhigher than 5 ppm. We have also observed this doubletat exactly 4.77 and 4.80 ppm under our conditions whena polymer sample, still containing trace amounts ofcatalyst, is heated at 100 °C for 24 h during the NMRexperiment. We are currently working to assign thetriplet erroneously assigned to the isobutenyl end group.

MA9619445

950 Macromolecules 1998, 31, 950

S0024-9297(96)01944-4 CCC: $15.00 © 1998 American Chemical SocietyPublished on Web 01/07/1998