´
´
´
R. Andres, E. de Jesus, F. J. de la Mata, J. C. Flores, R. Gomez
FULL PAPER
[5c]
calcd. C 70.70, H 6.53; found C 70.53, H 6.62. 1H NMR (300 MHz,
CDCl3, 25 °C): δ ϭ 7.42 (m, 12 H, C6H5), 7.26 (m, 18 H, C6H5),
6.28 and 6.14 (AAЈ and BBЈ parts of an AAЈBBЈ spin system, 4 H,
C5H4), 0.85 and 0.74 [A and B parts of an A2B2 spin system, 12
H, Si(CH2)2Si], 0.49 (s, 9 H, CH3) ppm. 13C{1H} NMR (300 MHz,
CDCl3, 25 °C): δ ϭ 136.9 (Cipso, C6H5), 134.4 (Cmeta, C6H5), 129.1
E. He, C. N. Moorefield, Chem. Rev. 1999, 99, 1689Ϫ1746.
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,
[6d]
C5H4), 116.3 (C5H4), 6.5 and 4.6 [Si(CH2)2Si], Ϫ5.0 (CH3) ppm.
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´
S. Arevalo, J. M. Benito, E. de Jesus, F. J. de la Mata, J. C.
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(50 mL) and equipped with a magnetic stirrer was evacuated four
times and refilled with pre-dried ethylene gas. Keeping the flask
pressurized with ethylene (1 bar) and stirred at room temperature,
a toluene solution of methylaluminoxane (MAO, 0.83 mL, 1.5 )
was syringed through a septum. After 5 min, a toluene solution
of the catalyst (0.50 mL, 2.5 m) was injected into the flask with
simultaneous starting of a stopwatch. The polymerization was
quenched 10 min later by closing the ethylene feed, release of the
overpressure and addition of acidified methanol (4% v/v HCl). The
mixture was stirred for 6 h and the polymer was filtered, washed
with copious amounts of methanol, and dried in an oven to con-
stant weight. Molecular weights were determined by gel-permea-
tion chromatography (GPC).
´
Flores, R. Gomez, J. Organomet. Chem. 2000, 602, 208Ϫ210.
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Acknowledgments
We acknowledge the DGESIC-Ministerio de Educacion y Cultura
(Project PB97-0765) and the University of Alcala (project E043/
2001) for financial support.
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Received February 15, 2002
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