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These systems have been calculated theoretically by Fan and Ziegler: (a) Fan, L.; Krzywicki, A.; Somogyvari, A.; Ziegler, T. Inorg. Chem. 1994, 33, 5287. (b) Fan, L.; Krzywicki, A.; Somogyvari, A.; Ziegler, T. Inorg. Chem. 1996, 25, 4003.
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0001079509
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These systems have been calculated theoretically by Fan and Ziegler: (a) Fan, L.; Krzywicki, A.; Somogyvari, A.; Ziegler, T. Inorg. Chem. 1994, 33, 5287. (b) Fan, L.; Krzywicki, A.; Somogyvari, A.; Ziegler, T. Inorg. Chem. 1996, 25, 4003.
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42
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16944362978
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note
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The reported values are the angle between the normal vectors of the two planes defined by the Ni, N, C atoms of the Ni - diimine ring and C1, C2, C6 atoms of the aryl ring.
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-
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43
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16944365458
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note
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Two linear transit calculations were performed in which one of the Ni-C(ethylene) distances was used as the reaction coordinate. The reverse process, from the resting state to the free Ni alkyl cation and free ethylene unit, was examined.
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44
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16944363411
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Woo, T. K.; Margl, P. M.; Deng, L.; Blöchl, P. E.; Ziegler, T. Work in progress
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Woo, T. K.; Margl, P. M.; Deng, L.; Blöchl, P. E.; Ziegler, T. Work in progress.
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45
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6444240989
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0030465140
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Woo, T. K.; Margl, P. M.; Lohrenz, J. C. W.; Ziegler, T. J. Am. Chem. Soc. 1996, 118, 13021.
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47
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16944365079
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note
-
We have also examined the first insertion or chain initialization process with our pure QM/MM model. The first insertion of ethylene into the Ni - methyl bond is calculated to proceed through a barrier of 5.7 kcal/mol. This is significantly diminished from the pure QM model, which gives a first insertion barrier of 11.1 kcal/mol.
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-
-
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48
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16944366869
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note
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The QM/MM structures 3 and 4 correspond to the pure QM structures 7a and 8a of ref 10.
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49
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16944364810
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Professor Maurice Brookhart (Department of Chemistry, University of North Carolina at Chapel Hill). A private communication.
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Professor Maurice Brookhart (Department of Chemistry, University of North Carolina at Chapel Hill). A private communication.
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50
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16944361957
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note
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This is further corroborated by the experimental observation that increased ethylene pressures decrease the branching, while not dramatically affecting the polymer yields or molecular weights.
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51
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33746295241
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Brintzinger, H. H.; Fischer, D.; Mülhaupt, R.; Rieger, B.; Waymouth, R. M. Angew. Chem., Int. Ed. Engl. 1995, 34, 1143.
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0041911718
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Morokuma, K.; Yoshida, T.; Koga, N. Organometallics 1996, 15, 2766.
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0000204495
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Kawamura-Kuribayashi, H.; Koga, N.; Morokuma, K. J. Am. Chem. Soc. 1992, 114, 8687.
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57
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16944365819
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note
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Comparison of the combined QM/MM and the stepwise QM then MM methodologies can be found in ref 40.
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