16.7 Electrocyclic Reactions | Organic Chemistry

Chad provides a comprehensive lesson on Electrocyclic Reactions, ring-openings and ring closures. He begins by comparing thermal and photochemical conditions for a ring closure. He then shows how disrotatory or conrotatory rotation in the transition state needs to lead to constructive overlap for a reaction to be 'allowed.' He then summarizes the Woodward-Hoffmann rules as they pertain in electrocyclic reactions. Chad concludes the lesson by showing how to predict the stereochemistry of the products of electrocyclic reactions.
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00:00 Lesson Introduction
00:39 Electrocyclic Reactions; Thermal vs Photochemical Conditions
03:27 Disrotatory vs Conrotatory
14:03 Summary of Woodward-Hoffmann Rules
15:28 Predicting Stereochemistry in Electrocyclic Reactions
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[@ivanmartindelcampo]

Yea I can’t seem to ever memorize those electron rules, I just always draw the end on FMO’s but I wouldn’t be able to without these videos of yours. Pericyclic rxns are definitely not easy so thank you for these resources!!

[@ChadsPrep]

Glad the channel is helping - Happy Studying!

[@chdfnh]

I had trouble understanding the other version of the video, but this one helped me a lot. Thank you Chad!

[@ChadsPrep]

You're welcome, Juan!

[@user-hp4wb3zh7e]

Thanks a lot for the clear explanation. Gonna love it 🥰

[@ChadsPrep]

You’re welcome! 😊

[@mashhuranurilloeva9411]

Absolutely amazing, thank you so much for all the help I learned so much from you just in the past 10 minutes !

[@ChadsPrep]

Glad to hear it - you''re welcome!

[@user-ly9ok5ly1z]

Thank you for the clear explanation, I always come to watch your video after taking lectures from my professor to be more clear about the content.

[@ChadsPrep]

Excellent!

[@sweetiee17x3]

this is so helpful! thank you so much!

[@ChadsPrep]

you're so welcome!

[@bosspink97]

Thanks a lot!!! I totally understand it!!

[@ChadsPrep]

You're welcome!

[@amanaryatosh5355]

thnx a lot Chad for helping me out just before my test...U r a life saver

[@ChadsPrep]

Glad the channel is helping you.

[@prernasharma9293]

Thank you!!!!!!!!!!!!!

[@ChadsPrep]

You are welcome, ps!

[@calebp8637]

This has been confusing me. Thanks for the clear explanations!

[@ChadsPrep]

Glad to hear the video is helpful, Caleb - thanks for commenting!

[@mealsbylineche5156]

Awesome!

[@ChadsPrep]

Thanks!

[@rizwanilyas4289]

Very helpful ☺️👍

[@ChadsPrep]

Glad to hear it, Rizwan ilyas!

[@hainguyentuan418]

what an enthusiasm teacher

[@ChadsPrep]

Thanks!

[@ellatimm4297]

Great video

[@ChadsPrep]

Glad you enjoyed it, Ella.

[@dylanfrey1033]

I think the part that I wasn't getting was if the methyl was in or out and this helps a lot. Thanks.

[@ChadsPrep]

Glad it helped, Dylan - Happy Studying!

[@taksnodar3546]

For 4n+2 π thermal conditions is disrotatory and the stereochimie is cis because the two methyl group push up, but I don't understand why for 4n π photochemical conditions is trans stereochimie, while is disrotatory also and the two methyl groups push also upwards

[@fakhrulnawawi9681]

Thanks so much..I lack of imagination..by watching this video I no longer confuse

[@ChadsPrep]

Glad to hear it - you're welcome!