Alphabetical Naming Order After Lowest Carbon?

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Nick_Ida 1D
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Alphabetical Naming Order After Lowest Carbon?

Postby Nick_Ida 1D » Thu Mar 02, 2017 10:28 am

I am I correct in that when naming based on the IUPAC scheme, we take priority of the lowest number C bonded to the hydrocarbon groups and then after that (if the molecule is identical forward and reverse) we utilize the alphabetical order of the alkanes (ethyl take priority over methyl)? Or does that alphabetical order always determine the naming order of the molecule after the lowest number C bonded to a hydrocarbon occurs?

Ashley Van Belle 2B
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Re: Alphabetical Naming Order After Lowest Carbon?

Postby Ashley Van Belle 2B » Thu Mar 02, 2017 12:12 pm

Yes, always you make sure that the substituents are bonded to the lowest carbons possible. However, in naming based on the IUPAC, you just concern yourself with the alphabetical order. It does not matter, in naming, whether the numbers are in the correct order.

As you recall in lecture, we had an example that determined the name of the compound to be 4-Ethyl-2,2-Dimethyl-Hexane. As you can see, the numbers are not the criteria that determines the naming; it simply tells you where the substituents are located on the alkane. Because ethyl is alphabetically before methyl (because when naming you ignore di-, tri-, etc.), that comes first.


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