33: Naming alkanes with complex substituents
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- Опубликовано: 1 июн 2020
- Instructions for naming the four most common complex substituents using common (not IUPAC) nomenclature. Includes instructions on alphabetizing substituents with iso, sec, and tert prefixes.
A good lecture on naming alkanes with complex substituents.
Thank you for this.Helped me a lot.
Thanks Roxi
Thank youuu❤❤❤
You’re welcome!
Tnx❤❤❤🎉🎉🎉🎉
You're welcome!
I have a question. You mentioned that the second example in 5:13 gets called "sec-butyl" because it is attached to the parent chain at its second carbon, but isn't that also the case with the first example as well? It looks like isopropyl is attached by its second carbon as well? Would it be incorrect to call the second example isobutyl? Thank you for clarifying.
Ooohhh that’s a very good observation and question! The “iso” prefix refers to a “CH” that has 2 methyl’s attached to it. My brain sees it as a “y” shape. In the case of isopropyl, the “CH” is also the 2nd carbon, but the “y” shape is apparently more important to chemists, so we call it isopropyl.
The isobutyl group has a CH with 2 methyl’s attached (that’s the iso part of the name). That’s only 3 carbons, so the 4th carbon comes from a CH2 group that precedes the iso group. In condensed notation, if you are familiar, is would be CH2CH(CH3)2. If you aren’t familiar with condensed notation, it is a CH2 with an isopropyl group attached.
Also, the sec prefix is used exclusively to describe unbranched substituents attached at the second carbon. So, a sec-pentyl would be 5 carbons in a row, no branching, attached to the parent chain at the second carbon.
Hopefully this is not too much rambling :) my brain is kind of tired but your question was too interesting for me to save for tomorrow. Please let me know if anything needs clarification!
@@RoxiHulet Thank you for responding so fast and for the informative explanation! 😊 Out of curiosity, is this playlist going based off of the David Klein textbook for organic chemistry? That is the textbook that my professor is using and your videos are quite literally in the exact same order of the topics that we are covering & it’s been extremely helpful watching your videos after class as additional lectures. :)
@@emam2715 yes it is! 😂 I have 3 playlists for organic because I teach in a school that uses the quarter system. If you are in a semester school, you’ll need playlists 1 and 2 to get you through the first semester.
Oh also, another thing... these videos are from an older edition of Klein. When you get to chapters 7, 8, 9-ish in your text, a couple of the videos will get slightly wonky, but you should be able to follow along fine.
@@RoxiHulet Thank you for confirming! 😊 So just to make sure, playlists 1 & 2 cover a semesters worth of Organic Chemistry 1 correct? Do you happen to have a playlist for Organic Chemistry II?