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4
. Conclusions
In conclusion, the reaction rate dichlorocyclopropanation of sty-
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[
[
[
rene catalyzed by phase-transfer catalyst combined with ultrasonic
irradiation was investigated. The factors affecting the overall reac-
tion rate, such as the effect of stirring speed, quaternary ammo-
nium salts, amount of catalyst, amount of sodium hydroxide and
temperature were studied to determine the optimal operating con-
ditions. The apparent reaction rates were observed to obey the
pseudo-first order kinetics with respect to the styrene. The reac-
tion rate increased with increasing temperature and catalyst
amount. Nevertheless, there is an optimum value of the sodium
hydroxide amount to promote the yield or to enhance the rate of
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[
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Acknowledgment
[
[
The authors would like to thank The National Science Council,
Taiwan, Republic of China for financial support under the Grant
No. NSC 95-2221-E-241-022-MY3.
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