Naming Branched Substituents – Tert-Butyl, Isopropyl, isobutyl, tertbutyl, and more

Nomenclature Branched Substituents isopropyl isobutyl tertbutyl Video Tutorial Orgo Leah FischNaming Organic Compounds Series: Video 4
This tutorial video shows you how to name organic compounds with substituents coming off their substituents. This includes the ‘long’ version of naming each individual group, and the accepted abbreviations like tert-butyl and isopropyl.

(Watch on YouTube: Substituents. Click CC on bottom right for transcript.)

<– Watch Previous Video: Naming Branched Chain Alkanes
–> Watch Next Video: Naming Cycloalkanes and Bicyclo Alkanes

This is Video 4 in the Naming Organic Compounds Video Series. Click HERE for the entire series.

Need a review on Functional Groups? Watch the Functional Groups Video, Download the Cheat Sheet, then try the Quiz.


  1. This video helped clarify my questions on the structures. Thank you!

  2. Mazin Nasralla says

    Regarding 4-(1-methylethyl)-octane couldn’t you drop the 1 as that’s the only place the methyl group can go? If in doubt is it always best to add a number?

    What do you use as reference? I went to IUPAC website but didn’t find it very useful.

    I like your videos. To the point.

    • Leah4sci says

      I’ve seen it named without a number. I personally would keep the number to avoid any potential confusion

  3. Much more interesting and understandable than a 4 roomed packed class.
    Thank u for this video, I was having a trouble in understanding this topic.
    Well now I am surely getting 6 marks in my finals..

  4. It’s not 4-(ethyl-1-methyl) because of the alphabetical rule?

    • Be careful Clarice. Ethyl is considered the parent of the branch and so is not alphabetized with the substituents ON the branch

  5. SyahirahShaff says

    thank you for a very clear info from you. most appreciated:)

  6. monica nguyen says

    Thank you for being awesome! Seriously saving my life and making this process towards medical school a little more smoothly. So very very grateful to have run cross you on youtube!

  7. Thank you! I love you 🙂

  8. You are the best !!! short, simple and to the point

  9. Please, do not stop doing what you’re doing. It’s obvious that you love this thing. Your method of teaching is amazing and your help so precious. Your voice is nice too! Thank you thank you thank you 🙂

  10. Thank you sooooo much It is amazing .

  11. Awesome! this video helped me a lot! to understand iso and sec and tert! which was like greek and latin to me before..
    keep posting!
    where are you from.
    oh! and i too have a friend named leah!

    • Thank you, I’m so glad I can help you make sense of this complex topic.
      As for your question, I grew up in Brooklyn (NY) but currently reside in Long Island (NY)

  12. Saquib Shaikh says

    leah is awesome, thanx

  13. awesome!!!! thanks 4 helping i was having a lot of trouble regarding this!!

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