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Topic: reaction mechanism of the esterfication reaction  (Read 2940 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!

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.
Stereograms of the 32 crystallographic point groups: little bike wheels of cold, hard, pure rationality.

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!

Offline MissPhosgene

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

Okay.

Why does the catalyst you specified facilitate the reaction?

Do you know how to prevent polymerization?

Stereograms of the 32 crystallographic point groups: little bike wheels of cold, hard, pure rationality.

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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