Common Names

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

Common Names

Postby Dianna Grigorian 1C » Fri Mar 03, 2017 2:04 pm

In regards to the example from class today, how do we know to include "iso" in the naming of the molecule? When should this be included and when is it not needed?

kara_kremer_2N
Posts: 20
Joined: Fri Jul 15, 2016 3:00 am

Re: Common Names

Postby kara_kremer_2N » Fri Mar 03, 2017 2:36 pm

When carbon chains are in the specific compositions mentioned in the course reader, the substituent is given an iso- prefix. In any other arrangement, iso- is not included in naming. For example, -< this skeletal structure substituent would be named isopropyl. Basically iso- is used when the middle carbon in the substituent is attached to the parent chain.

Deanna_Nguyen_3L
Posts: 10
Joined: Fri Jul 22, 2016 3:00 am

Re: Common Names

Postby Deanna_Nguyen_3L » Sun Mar 05, 2017 2:56 pm

How do you know when to use the prefix "neo"? Is it always when there is a tert-butyl?

Mana_Sheykhsoltan_1A
Posts: 12
Joined: Fri Jul 22, 2016 3:00 am
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Re: Common Names

Postby Mana_Sheykhsoltan_1A » Sun Mar 05, 2017 3:58 pm

I think the prefix iso- is used when you see the structural pattern (CH3)2CH (two CH3 molecules are attached to the carbon of CH). The prefix neo- is used when you see the structural pattern (CH3)3C (three CH3 molecules are attached to a carbon). Iso- and neo- are structural identifiers and are part of the substituent name, so when you're alphabetizing, keep in mind that the prefixes are not ignored as they are with prefixes of substituents. Hope this helps!


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