46
M.H. Lee et al. / Journal of Organometallic Chemistry 561 (1998) 37–47
1
22.33, 102.73, 29.47, 28.05, 12.82, 12.06. EI-MS: m/z
refinement converged at R =0.0481 (0.0308), wR =
1 2
+
(
relative intensity) 474 (M , 59), 294 (100). Anal. Calc.
0.1171 (0.0782) and gooness-of-fit=1.185 (1.061). The
atomic coordinates and equivalent isotropic thermal
parameters for non-hydrogen atoms are listed in Tables
for C H Cl Zr: C, 60.74; H, 5.10. Found: C, 60.75; H,
2
4
24
2
5
3
.26.
5
and 6.
.8. Polymerizations
Into a well degassed 500 ml-glass reactor, 150 ml of
Acknowledgements
toluene were placed. The temperature was adjusted to a
constant (25, 50, 70, 90°C each) using a waterbath
thermostat, and propylene was saturated at 1.2 atm
with vigorous stirring. A toluene solution of MAO (10
ml, 20 mmol) was syringed into the reactor and then a
toluene solution of 10 mmol of catalyst was immediately
added. The polymerization was monitored by measur-
ing the rate of monomer consumption using a hot-wire
flowmeter (Sierra Instrument model 820) connected to a
computer containing an A/D converter. After 1 h, all
the reactions were quenched by the addition of
methanol. The resulting polymer was precipitated by
adding a MeOH/HCl solution. Filtration, washing with
MeOH/HCl followed by EtOH washing and then
overnight vacuum drying afforded polypropylenes. A
viscous oily polymer was obtained by vacuum drying
after evaporation of toluene. Catalytic activity was
calculated by comparing the rate of monomer con-
sumption with the amount of polymer obtained (95%
error).
We gratefully acknowledge financial support pro-
vided by the Korea Science and Engineering Founda-
tion and the Korea Advanced Industrial Technology.
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4
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1
29.
˚
U (C) for CH, d(CꢀH)=0.97 A, 1.2×U (C) for CH ,
eq
eq
2
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˚
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eq
3