Intermediates in Reaction Profiles


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ntruong2H
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Intermediates in Reaction Profiles

Postby ntruong2H » Sun Mar 05, 2017 12:42 am

Hello, I was wondering, when looking at or drawing reaction profiles, how do we account for the formation of intermediates? Further, how do we know, based on the amount of "humps" in a reaction profile, how many intermediates are formed? Thank you.

Tyler_Ash_3C
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Re: Intermediates in Reaction Profiles

Postby Tyler_Ash_3C » Sun Mar 05, 2017 12:18 pm

The intermediates are represented by the minimum of the curve between two peaks. The two peaks represent transition states, but not intermediates. In general, the number of intermediates formed is one less than the number of peaks or "humps" because when the graph returns to a minimum at the end it represents the formation of products rather than intermediates.

Chem_Mod
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Re: Intermediates in Reaction Profiles

Postby Chem_Mod » Mon Mar 06, 2017 11:08 am

Page 85 of the course reader has an example of a reaction profile with intermediates. As Tyler described, intermediates are represents as a minimum between two peaks.

ntruong2H
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Re: Intermediates in Reaction Profiles

Postby ntruong2H » Mon Mar 06, 2017 9:46 pm

Chem_Mod wrote:Page 85 of the course reader has an example of a reaction profile with intermediates. As Tyler described, intermediates are represents as a minimum between two peaks.


How can you tell how many there are though? Because the example in the course reader, there is 1 minimum between the two peaks, but there are two intermediates in the reaction?

Chem_Mod
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Re: Intermediates in Reaction Profiles

Postby Chem_Mod » Wed Mar 08, 2017 8:32 am

ntruong2H wrote:
Chem_Mod wrote:Page 85 of the course reader has an example of a reaction profile with intermediates. As Tyler described, intermediates are represents as a minimum between two peaks.


How can you tell how many there are though? Because the example in the course reader, there is 1 minimum between the two peaks, but there are two intermediates in the reaction?


The example in the course reader is due to the breakdown of H-Br into Br- when the alkene is transferring the H from H-Br to itself. The # of intermediates from the reaction profile is true for tracing one reactant/one intermediate reaction.


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