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Topic: reaction mechanism of the esterfication reaction  (Read 3680 times)

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Offline Stoian

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reaction mechanism of the esterfication reaction
« on: January 04, 2011, 11:01:00 AM »
Does anyone know the reaction mechanism for the reaction:

Terephthalic acid + Ethylene glycol ---> bis(2-hydroxyetil)terephthalat (no cathalyst,aprox 180-200ºC)
and

dimethylterephthalate + Ethylene glycol ---->bis(2-hydroxyetil)terephthalat
(aprox.270ºC,cathalyst: Sb2O3 ).


please help me!
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Offline MissPhosgene

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Re: reaction mechanism of the esterfication reaction
« Reply #1 on: January 04, 2011, 12:44:26 PM »
Both reactions are acyl substitutions.
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Offline Stoian

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Re: reaction mechanism of the esterfication reaction
« Reply #2 on: January 05, 2011, 05:30:46 PM »
could you be more explicit? show me!
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Offline MissPhosgene

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Re: reaction mechanism of the esterfication reaction
« Reply #3 on: January 06, 2011, 12:13:08 AM »
Quote from: Stoian on January 05, 2011, 05:30:46 PM
could you be more explicit? show me!

Okay.

Why does the catalyst you specified facilitate the reaction?

Do you know how to prevent polymerization?

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Offline Stoian

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Re: reaction mechanism of the esterfication reaction
« Reply #4 on: January 10, 2011, 12:59:47 PM »
Thanks a lot for the reaction mechanism!
i need this for a project( the synthesis of the poly ethylene terephthalate).

i think i was wrong about the catalyst.i didn't know much at the time. the catalyst used is a Zn acetate.

the polymerization should not be a problem in this process.
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