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"iso" naming

Posted: Thu Mar 09, 2017 4:15 pm
by Marco_Romo_1M
When do you put "iso" in front of the name? And does it received alphabetical priority or is it ignored?

Re: "iso" naming

Posted: Thu Mar 09, 2017 4:17 pm
by Ara Yazaryan 1E
Iso is not taken into alphabetical account, and it comes whenever there is a fork in the carbon substituent chain. For example: "isoethyl"

Re: "iso" naming

Posted: Thu Mar 09, 2017 4:20 pm
by Marco_Romo_1M
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

Re: "iso" naming

Posted: Thu Mar 09, 2017 4:47 pm
by Chem_Mod
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.

Re: "iso" naming

Posted: Thu Mar 09, 2017 10:33 pm
by Melanie_Wong_1K
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.