December 03, 2021, 02:04:01 PM
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Topic: Stereochemistry of E2 and alkene reactions?  (Read 802 times)

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Offline AWK

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Re: Stereochemistry of E2 and alkene reactions?
« Reply #15 on: March 03, 2021, 06:22:41 PM »
You can see everything in your sketches. Can you convert your sawhorse projections to Newman projection or directly draw anti- or syn-addition mechanism from Newman projection for butene or crotonic acid? Give it a try.
In addition, distinguish between symmetrical and unsymmetrical alkene, and cis- and trans-.
AWK

Offline sharbeldam

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Re: Stereochemistry of E2 and alkene reactions?
« Reply #16 on: March 03, 2021, 06:55:48 PM »
please tell me this is right so i can sleep
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Offline AWK

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Re: Stereochemistry of E2 and alkene reactions?
« Reply #17 on: March 04, 2021, 01:34:44 AM »
Now, if R1=R2≠H and such conformations are possible that in some Newman projection all identical substituents lie exactly above each other (as in the last equation (cis-syn) or in the first equation (trans-anti) after a half-molecule rotation by 180°) Meso compounds are formed.
Without asymmetric induction, in the second and third reactions, always racemates are formed.
AWK

Offline sharbeldam

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Re: Stereochemistry of E2 and alkene reactions?
« Reply #18 on: March 04, 2021, 02:44:54 AM »
Thank you so much AWK!! can you just confirm that in my last picture all the groups are correctly placed so i can make this video to help others as well ?
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Offline AWK

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Re: Stereochemistry of E2 and alkene reactions?
« Reply #19 on: March 04, 2021, 02:46:37 AM »
If there were mistakes, I would discuss them.
AWK

Offline sharbeldam

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Re: Stereochemistry of E2 and alkene reactions?
« Reply #20 on: March 04, 2021, 02:52:14 AM »
<3 I want you to know that i appreciate that, and you helping me, will indirectly help many others, thanks again
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