Resonance Trick Ortho Meta Para Addition EAS Intermediates

EAS resonance for ortho meta and para substituentsEAS Series: Video 10
Electrophilic Aromatic Substitution gets more difficult when the starting molecule is a substituted benzene. Not only do you have to know the reaction. You also have to know how the substituent will direct the incoming electrophile, and if the substituent will slow down (deactivate) or speed up (activate) the overall reaction.

But before you can tackle directing effects, you must have a very solid understanding of the reaction intermediates, particularly the resonance stabilized sigma complex for ortho, meta and para addition reactions.

The video below takes you through the detailed resonance intermediates to help you understand this concept, and then shows you my awesome shortcut because let’s face it, do you really want to draw resonance for every quiz/exam question if you don’t have to?

If you find the shortcut helpful (and time-saving) please let me know by leaving a comment below.

(Watch on YouTube: Ortho/Meta/Para. Click CC on bottom right for transcript.)

<– Watch Previous Video: Ortho Meta and Para Disubstituted Benzene Monster Trick
–> Watch Next Video:
Activating Groups are Ortho/Para Directors

This is Video 10 in the Electrophilic Aromatic Substitution Video  Series. Click HERE for the entire series.


  1. Usama Shahbaz says

    Can you please put up a video that explains aromatic, anti aromatic, and non aromatic ! These videos are exactly what I need to help me understand!

  2. Leah, your videos helps me A LOT. I’m literally struggling with my grades now. And when you say “..your professor wont ask the complete mechanism..” well, that didnt happen in my test. Thats why I need to take the test again. Thank you, thank you so much. Keep making videos and teaching Leah. You’re such a great teacher :’)

    • Leah4sci says

      Sarah most professors don’t. But since there are a few who do ask for it I do show it 🙂
      Sucks that you have to take the test again. What happened on the first one?

  3. thank you very very much for this video’s…GREAT JOB

  4. can u upload a video on vandiumpentoxide mechanism in alkanes

  5. useful video’s. Thank you

  6. Thank you so much ..this helped me a lot in thinking logically …you are a great teacher ! 🙂 🙂

  7. can u upload the video about the acyl compound?? thank you

  8. I sincerely wanna thank you for all this video’s. You are doing a great job!

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