Catálise estereoespecífica de estireno por titanocenos alquil-substituídos do tipo (RCp)2TiCl2

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Published: Dec 4, 2000
DOI: https://doi.org/10.26850/1678-4618eqj.v25.1.2000.p97-108
Keywords:
Titanocenos substituídos, Catálise homogênea, Poliestileno sindiotático

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Brasílio Carvalho de Araújo Pereira
Universidade Estadual Paulista, Instituto de Química, Araraquara, Brasil.
Stanlei Ivair Klein
Universidade Estadual Paulista, Instituto de Química, Araraquara, Brasil.
Marcos Lopes Dias
Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas Profa Eloisa Mano, Rio de Janeiro, Brasil.

Abstract

Uma série de sete complexos alquil substituídos do tipo (RCp)2TiCl2 (R= H, etila, n-propila, iso-propila, n-butila, iso-amila, ciclo-hexila) foi preparada juntamente com o ainda inédito contendo R= sec-butila, e o efeito do substituinte na polimerização do estireno foi investigada à temperaturas de polimerização de 0 e 50 oC. Foi encontrado que R = n-butila maximiza a produção de poliestireno sindiotático. Ligantes alquilas com R = RCH2- são superiores aos R = RR’CH- e ao precursor Cp2TiCl2 na produção de poliestireno sindiotático de alto peso molecular.

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How to Cite
Pereira, B. C. de A. ., Klein, S. I., & Dias, M. L. (2000). Catálise estereoespecífica de estireno por titanocenos alquil-substituídos do tipo (RCp)2TiCl2. Eclética Química, 25(1), 97–108. https://doi.org/10.26850/1678-4618eqj.v25.1.2000.p97-108
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Vol. 25 No. 1 (2000): Eclética Química
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Original articles
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References

DIAS, M. L., GIARRUSSO, A., PORRI, L. Polymerization of styrene with the TiCl3/methylaluminoxane catalyst system. Macromol., v.26, p.6664, 1993. [ Links ]

GRASSI, A., LASCHI, F., OLIVA, L., PELLECCHIA, C. A combined NMR and electron spin resonance investigation of the (C5(CH3)5)Ti(CH2C6H5)3/ B(C6F5)3 catalytic system active in the syndiospecific styrene polymerization. Macromol. Chem. Phys., v.196, p.1093, 1995. [ Links ]

BOSISIO, C., PORRI, L., RICCI, G. Polymerization of 1,3-butadiene, 4-methyl-1,3,-pentadiene and styrene with catalyst systems based on bis-cyclopentadienyl derivatives of titanium. Macromol.Rapid. Commun., v.17, p.781, 1996. [ Links ]

HOECKER, H., SAEKI, K. Polymerisation of ethylene with soluble Ziegler-Natta catalysts. Makromol. Chem., v.148, p.107, 1971. [ Links ]

GAVRILOV, A. B., SOLOVEICHIK, G.L., STRELETS, V. V. Eletronic and steric effects of substituents in electroreduction of bis(cyclopentadienyl) titanium and –zirconium chlorides. Metalloorg. Khim., v.2(2), p.431, 1989. [ Links ]

BRUCE, M. R. M., KENTER, A., TYLER, D. R. Electronic struvtures of the (h5-C5H5)2TiL2 complexes (L= F, Cl, Br, I, CH3). J. Am. Chem. Soc., v.106, p.639, 1984. [ Links ]

BIRMINGHAM, J. M., COTTON, F. A., PAUSON, P. L., WILKINSON, G. Bis-cyclopentadienyl derivatives of some transition elements. J. Am. Chem. Soc., v.75, p.1011, 1953. [ Links ]

BIRMINGHAM, J. M, WILKINSON, G. Bis-cyclopentadienyl compounds of Ti, Zr, V, Nb and Ta. J. Am. Chem. Soc., v.76, p.4281, 1954. [ Links ]

GARBASSI, F., GILA, L., PROTO, A. Metallocenes: new catalysts for new polyolefins. Polymer News, v.19, p.367, 1994. [ Links ]