IUPAC naming on page 93

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Eman_Burney_1D
Posts: 15
Joined: Wed Sep 21, 2016 2:57 pm

IUPAC naming on page 93

Postby Eman_Burney_1D » Sun Mar 05, 2017 11:05 pm

On page 93, the compound listed is (ignore the periods, I used them to keep the substituents above the specific carbons as listed on page 93) :

..... CH3 .CH2CH3
..... | .......|
CH3CCH2CHCH2CH3
...... |
...... CH_3


The name, as stated on the page, is 4-ethyl-2,2-dimethyl-hexane. What is the purpose of writing -2 after the ethyl? And when would you do this when naming?

Ana_Andrade_1A
Posts: 10
Joined: Wed Sep 21, 2016 2:57 pm

Re: IUPAC naming on page 93

Postby Ana_Andrade_1A » Sun Mar 05, 2017 11:20 pm

Eman_Burney_1D wrote:On page 93, the compound listed is (ignore the periods, I used them to keep the substituents above the specific carbons as listed on page 93) :

..... CH3 .CH2CH3
..... | .......|
CH3CCH2CHCH2CH3
...... |
...... CH_3


The name, as stated on the page, is 4-ethyl-2,2-dimethyl-hexane. What is the purpose of writing -2 after the ethyl? And when would you do this when naming?


There are two methyl substituents located both on the second carbon, and for each methyl it is necessary to state its position along the longest carbon chain. This is done when you have two of the same substituent and you say where they are each located along the parent carbon chain.

Chem_Mod
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Joined: Thu Aug 04, 2011 1:53 pm
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Re: IUPAC naming on page 93

Postby Chem_Mod » Mon Mar 06, 2017 11:42 am

Numbers refer to the substituents following them. So the 4 refers to the ethyl group and the two 2s refer to the 2 methyl groups.


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