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Topic: O chem *delete me*!!!!!!!!! PLEASE  (Read 9184 times)

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LuckyDude35

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O chem *delete me*!!!!!!!!! PLEASE
« on: September 08, 2004, 01:12:47 AM »
Ok, I have a question. I have a homework assignment that wants me to decide whether the major reaction is: proton transfer, substitution, or elimination and write them out. I need examples to tell which one to use or maybe a check list approach that I can follow to do the 10 problems. ANY help would be greatly appreciated, thank you very much!
                                        Confused in California

Offline Mitch

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #1 on: September 08, 2004, 01:22:39 AM »
Elimination would mean a double bond is formed. Substitution would mean an atom was replaced with an other atom. Perhaps if you posted one of the questions we can work it out with you.
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LuckyDude35

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #2 on: September 08, 2004, 01:27:57 AM »
Ok here goes:

bromomethane + hydrogen Sulfide (HS-) in DMF

Thank you very much!

LuckyDude35

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #3 on: September 08, 2004, 01:30:51 AM »
Another one is:

1-methylcyclopentanol + HCL at 0 degrees C

I just don't know how to get started, my teacher didn't give us any examples to go off of. Thank you for your help

Offline Mitch

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #4 on: September 08, 2004, 01:31:22 AM »
Out of those 3 compounds are there any good leaving groups in any of them?
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LuckyDude35

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #5 on: September 08, 2004, 01:32:17 AM »
Isnt the BR a leaving group?

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #6 on: September 08, 2004, 01:34:58 AM »
Yes you can kinda tell the Br- is a good leaving group. Can you also tell that the HS- has a lot of electron density around it which makes is a good nuleophile?
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LuckyDude35

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #7 on: September 08, 2004, 01:36:23 AM »
I thought it was a good nucleophile but wasn't sure, so that means this is a SN1 or SN2 reaction?

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #8 on: September 08, 2004, 01:40:09 AM »
Which one, SN1 or SN2, likes to have the carbon be least substituted with other R-groups?
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LuckyDude35

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #9 on: September 08, 2004, 01:41:47 AM »
I know the SN2 is primary, so SN2?

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #10 on: September 08, 2004, 01:43:01 AM »
Yes,  I think you understand the material just sit down with it and if you still have some questions go ahead and ask them.
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LuckyDude35

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #11 on: September 08, 2004, 01:46:05 AM »
To be perfectly honest I feel like I have no idea what I am doing with some of these. I saw the DMF, and I know that is polar aprotic and i know that is supposed to be SN2, does that mean that all the one with DMF are SN2?

LuckyDude35

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #12 on: September 08, 2004, 01:57:55 AM »
I drew out the equation and have a question, does the Br which left then attach to the H which was now alone after the S substituted for the BR?

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Re:O chem *delete me*!!!!!!!!! PLEASE
« Reply #13 on: September 08, 2004, 03:29:00 AM »
No, the S is still attached to the S. We did no Chemistry to remove it from the S.
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