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E1 Reaction Explained | Zaitsev's Rule, Stereochemistry, Competing Mechanisms

Chemistry in a Nutshell

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We cover the complete reaction mechanism for E1 in organic chemistry step-by-step, showing exactly how the leaving group departs, how the Lewis base attacks the beta hydrogen, Zaitsev's Rule for regioselectivity, stereoselectivity of cis- / trans- (Z / E) products, major vs minor products, and more. Using clear diagrams and curved arrows, we'll walk through how to predict products, avoid common mistakes, and more. Also called unimolecular elimination

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0:00 E1 Overall Reaction
0:54 E1 Mechanism
4:38 Where will the double bond go? (Regioselectivity & Zaitsev's Rule)
7:20 Will E or Z / cis or trans predominate? (Stereoselectivity)
9:04 Advanced Stereoselectivity Example
10:00 Newman Projection
11:56 Molecular Model
13:34 Product
15:19 E1 vs E2
16:51 E1 vs SN1

Citations:
Paula Yurkanis Bruice, "Organic Chemistry" 8th ed
https://openstax.org/details/books/or...
https://openstax.org/details/books/ch...
Periodic Table used with permission from https://sciencenotes.org/printable-pe...

Music: Electron Clouds with a Chance of Swing

17 Comments

@ChemistryinaNutshell Creator 10 months ago (edited) Pinned

Note: For the Advanced Example (9:04–15:19), it really is advanced. It might be an exam trap OR your class might completely ignore this. In standard E1 reactions with multiple beta-hydrogens, free rotation allows the system to scramble and yield the most stable thermodynamic product. However, when a rigid or restricted substrate has only a single active beta-hydrogen, conformational constraints and rapid ion-pair pathways heavily dictate the resulting stereochemistry. In many real-world cases (especially with bulky groups like this phenyl ring) the elimination happens so quickly after the leaving group departs that the molecule doesn't have time to fully rotate. It retains a 'stereochemical memory' of its starting conformation.

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@not_monalisa873 10 months ago

underrated channel!

@KrishBandi-sy3lg 10 months ago

Was absolutely waiting for SN1 reaction video thanks a bunch❤

@dileepreddy-08 10 months ago

Thank you i hope youtube recommends this channel to many more people. I am glad that i found it .

@Aizenstudying 7 months ago

ts is gold
gained a sub 🍁

@laurapezoa408 4 months ago

i love this channel!!!! you helped me a lot

@PinkyDevi-te1sl 7 months ago

Love your conceptual clarity ❤😊

@XiJinping84 10 months ago

The new banger ❤❤

@HibaSadou-o2u 9 months ago

you are a lifesaver, thank you so much!!!

@ShaurySingh001 10 months ago

:) after a long time I came back

@gwen_2308 1 day ago (edited)

Hi I am from India,I understand ur explanation very well can u do a Playlist for jee mains?,like previous year questions of every chapter?it would be so helpful for me BTW just choose 25 differe4type of questions from each chapter jee mains and advanced level and do sessions

@poonambalidhanda3913 10 months ago

First to hype this video 😊 0:32

@XiJinping84 10 months ago

Mam plz explain optical isomerism.. 😔

@AtharvKumar-tm5jx 9 months ago

Why doesn't the H2O attacks the postive charged alpha carbon

@sakurale356 5 months ago

So on the advanced stereoselectivity, you said if there's only 1 H on beta carbon we won't get a mixed product, but wasn't the first example of the stereoselectivity only have 1 H on the beta carbon as well? Or you're saying in total, because there are 3 beta carbons in the first example?