REVIEWS H.-H. Brintzinger et al. 26.1180; I, might thus be reconverted to C by alkyl exchange <strong>with</strong> the AIMe, content of MAO. [731 a) M. Bochmann, S. J. Lancaster, J. Organomet. Chem. 1992, 434. CI; b) Angew. Chem. 1994, 106, 1715; Angew. Chem. Int. Ed. Engl. 1994. 33, 1634. [741 Formation of a zirconocene ally1 cation from [Cp,ZrMe]+ and C,H, has been observed in the gas phase: C. S. Christ, J. R. Eyler, D. E. Richardson, J Am. Chem. Sue. 1988, 110, 4038. 1751 A decrease of activities <strong>with</strong> increasing MA0 concentrations is occasionally observed at very highAl:Zr ratios: J. C. W. Chien, R. Sugimoto, J. Poiym. Sci. Part A 1991, 2Y, 459; and ref. [132a]. [76] M. Ystenes, J. Cutal. 1991. 129, 383; in ref. [6e], p. 71. [771 0. T. Laverty, J. J. Rooney. J. Chem. Soc. Furaduy Truns. 1 1983. 79, 869. [781 M. Brookhart. M. L. H. Green. J. Organomet. Chem. 1983, 250, 395; M. Brookhart. M. L. H. Green, L. Wong, Prog. Inorg. Chem. 1988, 36, 1. [791 Experimental and theoretical investigations on agostic interactions: a) R. B. Calvert, J. R. Shapley, J. Am. Chern. Sue. 1978. 100. 7726; h) S. Obara, N. Kogd, K. Morokuma. J Orgunomel. Cl7em. 1984, 270. C33; N. Kogd. S. Obara. K. Morokuma, 1 Am. Chem. Sue. 1984, 106, 4625; c) 0. Eisenstein, Y. Jean, ?hid. 1985, 107, 1177; d) M. J. Calhorda, J. A. M. Simoes, Orgunometu//ics 1987, 6, 1188; el K. Tatsumi, A. Nakamura, J. Am. Chem. Soc. 1987,109,3195; Orgunometalhcs 1987,6,427; K. Mashima. A. Nakamura. .I Organomer. Chem. 1992, 428, 49; f) A. Shiga. J. Kojima, T. Sasaki, Y Kikuzono. [bid. 1988, 345, 275; g) R. F, Jordan, P. K. Bradley, N. C. Baenziger. R. E. LaPointe, J. Am. Chsm. Soc. 1990, 112, 1289; Z. Guo, D. C. Svenson. R. F. Jordan. Orgunomeiullics 1994, 13, 1424. [SO] H. Krauledat, H. H. Brintzinger, Angen. Chem. 1990, 102, 1459; Angew. Chem. Int. Ed. Digl. 1990. 29, 1412. [81] L. Clawson, J. Soto, S. L. Buchwald. M. L. Steigerwald. R. H. Grubbs, J. Am. Chem Sor. 1985. 107, 3377. [82] W. E. Piers. J. E. Bercaw, J. Am. Chem. So
<strong>Chiral</strong> <strong>Metallocene</strong> <strong>Catalysts</strong> [I 131 Since [mmmm] > 0.9 corresponds to a diastereomer excess of >95 % for each insertion step. these homogeneous polymerization catalysts are roughly comparable to the most highly stereoselective organometallic catalysts employed for other C -C- coupling reactions: H. Brunner, Top. Stereochem. 1988, 18, l2Y; Siwrhei.\ 1988. 645; D. Seebach, Angew. Chem. 1990, 102. 1363; Angew. Clrmi. In/. Ed. Engl. 1990, 29, 1320. [I141 a) B. Rieger. J C. W Chien, Polym. Bull. (Berlinj 1989,21,159; B. Rieger, X. Mu. D. T. Miillin, M. D. Rausch. J. C. W. Chien. Mucromolecules 1990, 23, 3559: h) Y X. Chen. M. D. Rausch. J. C. W. Chien. Organometullics 1994.13. 74x. [I151 ii) H. N. Cheng. M. A. Bennett. iMokromol. Chem. 1987, 188, 135; H. N. Cheng. J. A. Ewen, thid. 1989, IYO. 1931; H. N. Cheng. G. N. Babu, R. A. Newmark. J. C. W. Chien, Macrumolecuks 1992, 25, 6980; H. N. Cheng, iMokromol. Chrm. 7heorj Sfmul. 1993, 2, 561. b) Recently, the term "catalytic-bite control". which is applicable also to metal centers of C, symmetry, appears to be used more frequently instead of the previously used term "enantiomorphic-site control". [I161 a) J. A. Ewen. in ref. [6a], p. 271; b) J. A. Ewen, L. Haspeslagh. J. L. Atwood. H Zhang. J. Am. C/7~m. Sue. 1987, 109, 6544: c) J. A. Ewen, L. Haspeslagh. M J. Elder. J. L. Atwood. H. Zhang. H. N. Cheng, in ref. [6 b], p. 281 ; d) J. A. Ewen. R. L. Jones. A. Razavi, J. D. Ferrara. J. Am. Chem. Soc. 1988, 110. 6255; e) J. A Ewen, M. J. Elder, R. L. Jones, S. Curtis, H. N. Cheng, Stud. Stir/. So. Cuinl. 1990. 56. 439; f) J. A. Ewen, M. J. Elder, R. L. Jones, L. Haspeslagh. J. L. Atwood, S. G. Bott, K. Robinson, Makromol. Chem. Mucromol Sj,mp. 1991, 48/49. 253; g) J. A. Ewen, M. J. Elder in ref. [6e], p. 179; h) J. A. Ewen. M. J. Elder. Eur. Pal. Appl. 1993, EP-A 0537130; in ref. [6g], p. 9Y; J. A. Ewen in ref. [6h]. p. 181. [I 171 a) M. Antberg, L. L. Bohm, V. Dolle, H. Liiker, J. Rohrmann, W. Spaleck, A. Winter, 44th Sou~haest Reg. Meet. Am. Chem. Soc. 1988, Abstr. No. 48; b) W. A. Herrmiinn, J. Rohrmann, E. Herdtweck. W. Spaleck, A. Winter, Angen.. Chem. 1989, 101. 1536; Angeiv. Chem. In[. Ed. Engl. 1989. 28, 1511; c) W. Spaleck, M. Antberg, V. Dolle. R. Klein. J. Rohrmann. A. Winter, New J. C'liem. 1990. 14, 499; d) M. Antberg, V. Dolle, R. Klein, J. Rohrmann. W. Spaleck. A. Winter, Stud. Surf. Sci. Cutul. 1990. 56. 501 ; e) M. Antberg, V. Dolle. S. Haftka. J. Rohrmann. W. Spaleck, A. Winter. H. J. Zinimermann, :Mrrkromol. ('hem. Mucrumol. Swnp. 1991, 48/49, 333; f) W. Spaleck, M. Antberg. J. Rohrmann. A. Winter, B. Bachmann. P. Kiprof, J. Behm, W. A. Herrmann. Airgrw. Cl?em. 1992. 104. 1373; Angew. Chern. lnt. Ed. Engl. 1992, 31, 1347, g) W. Kaminsky, R. Engehausen. K. Zoumis, W. Spaleck, J. Rohrmann. Mukrornol. Chem. 1992, 193, 1643; h) W. Spaleck, F. Kiiber, A. Winter, J. Rohrmann, B. Bachmann, M. Antberg, V. Dolle, E. F. Paulus, Urgunorneralks 1W4. 13. 954; i) W. Spaleck. M. Antberg. M. Auibach, 8. Bachmann. V. Dolle, S. Haftka, F. Kiiber, J. Rohrmann, A. Winter in ref. [bgl. p. 83: h! Spaleck. M. Aulbach, B. Bachmann, F. Kiiber. A. Winter in ref. [6h]. p. 137. [lIX] S. Miya. T. Yoshimura. T. Mise, H. Yamdzaki. Polym. PI-epr. Jpn. 1988, 37. 2x5: T. Mise, S. Miya. H. Yamdzdki, Chem. Lett. 1989, 1853;s. Miya,T. Mise, H. Yamaziiki. Slud. Surf Sci. Catul. 1990. 56, 531. [I 191 a) S. Collins. W. J. Gauthier, D. A. Holden. B. A. Kuntz, N. J. Taylor. D. G. Ward, Orgunamrtullics 1991.10,2061; b) I. M. Lee, W. J. Gauthier, J. M. Ball. B. lyengar. S. Collins. ;bid. 1992, 11, 2115. [I201 a) W. Riill. H. H. Brintzinger. B. Rieger, R. Zolk, Angew. Chem. 1990, 102, 339; Angwv. C/iem. Int. Ed. Engl. 1990, 29, 279; b) B. Rieger. A. Reinmuth. W. Roll. H. H. Brintzinger, J. Mol. Calul. 1993, 82, 67; c) A. Reinmuth, Dissertation. Universitiit Konstanz. 1992; d) U. Stehling, J. Diebold, R. Kirsten. W. Roll. H. H. Brintzinger. S. Jiingling, R. Miilhaupt, F. Langhauser. Orgunom~wllics 1994. 13, 964; e) T. Haselwander, S. Beck, H. H. Brintzinger in ref. [bg]. p. 181. [121] Comparison of results from different laboratories is difficult not only because of variations in 7, and other catalysis parameters. but also because of inexplicit corrections of signal intensities for contributions from various end group and regio-irregularity signals and by use of different stereoregularity measurea [I 1 I]. [I221 A. Zambelli. P. Ammendola. A. Grassi, P. Longo, A. Proto. Macromolecules 1986. IY. 2703; A. Zambelli. P. Longo. P. Ammendola. A. Grassi, GKZ.
Change language