"iso" naming

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Marco_Romo_1M
Posts: 36
Joined: Wed Sep 21, 2016 2:59 pm

"iso" naming

Postby Marco_Romo_1M » Thu Mar 09, 2017 4:15 pm

When do you put "iso" in front of the name? And does it received alphabetical priority or is it ignored?

Ara Yazaryan 1E
Posts: 44
Joined: Wed Sep 21, 2016 2:59 pm

Re: "iso" naming

Postby Ara Yazaryan 1E » Thu Mar 09, 2017 4:17 pm

Iso is not taken into alphabetical account, and it comes whenever there is a fork in the carbon substituent chain. For example: "isoethyl"

Marco_Romo_1M
Posts: 36
Joined: Wed Sep 21, 2016 2:59 pm

Re: "iso" naming

Postby Marco_Romo_1M » Thu Mar 09, 2017 4:20 pm

For question 1.16 in the organic chemistry textbook, why is the answer 2-isopropyl-1,1-dimethylcyclopentane and not 1,1-dimethyl-2-isopropylcyclopentane? Following the alphabetical ordering rule

Chem_Mod
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Re: "iso" naming

Postby Chem_Mod » Thu Mar 09, 2017 4:47 pm

Ara Yazaryan 1E wrote:Iso is not taken into alphabetical account, and it comes whenever there is a fork in the carbon substituent chain. For example: "isoethyl"



This is incorrect. Iso and neo are the 2 prefixes that are included when alphabetizing substituents.

Melanie_Wong_1K
Posts: 22
Joined: Fri Jul 22, 2016 3:00 am

Re: "iso" naming

Postby Melanie_Wong_1K » Thu Mar 09, 2017 10:33 pm

Marco_Romo_1M wrote:For question 1.16 in the organic chemistry textbook, why is the answer 2-isopropyl-1,1-dimethylcyclopentane and not 1,1-dimethyl-2-isopropylcyclopentane? Following the alphabetical ordering rule

This one is tricky, so you take iso- into account when alphabetizing the substituents, but not di-. Therefore, you have to think of it as if dimethyl starts with an M and isopropyl starts with an I, which is why isopropyl is first.


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