iso and sec

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JukaKim_1D
Posts: 24
Joined: Fri Sep 25, 2015 3:00 am

iso and sec

Postby JukaKim_1D » Wed Feb 24, 2016 7:12 pm

What is the difference between iso and sec exactly?

Emma Edmond 3E
Posts: 29
Joined: Fri Sep 25, 2015 3:00 am

Re: iso and sec

Postby Emma Edmond 3E » Wed Feb 24, 2016 9:25 pm

Sec- basically means that the ring carbon atom is attached to a secondary carbon atom on the substituent. Some common examples are sec-butyl, sec-pentyl, and sec-hexyl. Iso- means that a compound has the same chemical formula but is different structurally (many times they are branched so that the substituents are laid out differently). Some common examples are isopropyl, isobutyl, isopentyl, and isohexyl.

Chem_Mod
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Re: iso and sec

Postby Chem_Mod » Thu Feb 25, 2016 12:52 am

When you are naming a COMPOUND, iso means that there is a V-shaped fork at some end. Eg. isobutane, isopentane.

When you are naming a SUBSTITUENT, iso means that there is a V-shaped fork at the END of the substituent. sec- means that there is a 2ndary carbon adjacent to the point of attachment, or another way of thinking is that the fork is now at the BEGINNING of the substituent.


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