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Topic: Reaction Coordinate Diagrams?  (Read 5901 times)

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Offline jawad813

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Reaction Coordinate Diagrams?
« on: January 20, 2010, 11:24:58 AM »
Hi everbody

I am a Pharmacy student from Denmark, who cant figure out how to solve this "chemical Equation" i hope somebody can help me to solve these 3 quistions before Friday...

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Offline stewie griffin

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Re: Reaction Coordinate Diagrams?
« Reply #1 on: January 20, 2010, 12:42:09 PM »
Forum Rules dictate that you must first show your work/attempt before help can be given  ;). Thus I will answer your question with a question.
What do you understand a transition state to be? What is an intermediate? When something is lower in energy, what does that mean for it's relative position in a reaction coordinate diagram?
If you can answer these then I think you're pretty much home free.
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Offline jawad813

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Re: Reaction Coordinate Diagrams?
« Reply #2 on: January 20, 2010, 01:30:13 PM »
Hi again

a carbocation which exist only transiently during course of the multistep is called a intermediate

a transitionstate is the highst-energy structure involved in a step of reaction.

Well, if you want to se that i have tried to solve it, i have drawed what i have drawn i paper, in paint...but i am not really satisfied with the result, and its why i am asking here :) 
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Offline stewie griffin

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Re: Reaction Coordinate Diagrams?
« Reply #3 on: January 20, 2010, 02:01:09 PM »
Ok you understand transition state good enough. Note that not all intermediates are carbocations though... there's all sorts of intermediates that can exist in the universe. An intermediate is just a compound present on the way to the final product but is lower in energy than the transition state. Transition states occur at the "top of the hill" between starting material, intermediates, and product.
So if A is the starting material, and C is the final product, what is B called? Is it a transition state or a product?
On your drawing, you have A and C at about the same y-axis value. What is the y axis? Should they be at the same value?
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Offline jawad813

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Re: Reaction Coordinate Diagrams?
« Reply #4 on: January 20, 2010, 02:12:48 PM »
Well i think that i have figured it out  ;D

There are two transitionstates...like the picture below
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Offline stewie griffin

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Re: Reaction Coordinate Diagrams?
« Reply #5 on: January 20, 2010, 02:17:22 PM »
Yes there are two transition states needed. Good job. I can't seen your drawing though...
Make sure you pay attention to the relative energies of A, B, and C since it is clearly stated in the problem which is the most stable and which is the least stable.
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Offline jawad813

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Re: Reaction Coordinate Diagrams?
« Reply #6 on: January 20, 2010, 02:20:14 PM »
sorry forgot attaching the drawing before---

by the way i am not the picasso of our time, neither Augusto kekulé
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Offline stewie griffin

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Re: Reaction Coordinate Diagrams?
« Reply #7 on: January 20, 2010, 03:14:39 PM »
yeah that looks good to me  :)
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