Iso / Neo when to use

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Julianne Seog 3K
Posts: 24
Joined: Wed Sep 21, 2016 2:58 pm

Iso / Neo when to use

Postby Julianne Seog 3K » Fri Mar 10, 2017 4:48 am

On page 96 of the course reader, the first diagram was labeled to be isopropyl-cyclopentane. why cant it just be named propyl cyclopentane? what determines the prefixes of iso(or neo) to be added-- is it just the shape of the substituent chain?

nikita bhat 2D
Posts: 29
Joined: Wed Sep 21, 2016 2:59 pm

Re: Iso / Neo when to use

Postby nikita bhat 2D » Fri Mar 10, 2017 6:47 am

The actual formula is associated with the prefix iso and neo. For iso it is (CH3)2CH and for neo it is (CH3)3C. For both, I believe it requires that there be at least 5 carbons in order to use. If this criteria is not met, then use systematic naming.

Dianna Grigorian 1C
Posts: 72
Joined: Wed Sep 21, 2016 2:55 pm

Re: Iso / Neo when to use

Postby Dianna Grigorian 1C » Fri Mar 10, 2017 12:56 pm

The prefixes "iso" and "neo" refer to the structural arrangement of the substituent bonded to the carbon atoms. I think to determine whether we need to include them in the names we just need to be familiar what each is. Iso is attached at one end and branches at the other, similar to a Y shape. Neo is used when there are 5 or more carbons bonded on the subsistent.

Anna_Kim_2E
Posts: 31
Joined: Wed Sep 21, 2016 2:56 pm

Re: Iso / Neo when to use

Postby Anna_Kim_2E » Fri Mar 10, 2017 2:36 pm

iso on a substituent is used when it is not attached in a linear structure.


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