Chemistry Naming ethers: priority of alkyl substituent and ethoxy subsitutent

AI Thread Summary
In naming ethers with both alkyl and ethoxy substituents, the priority for numbering the carbon chain should be given to the substituent that results in the lowest overall numbering for the substituents. The confusion arises from different structures that may prioritize the ethyl or ethoxy groups differently. According to IUPAC rules, the numbering should start from the end of the chain that provides the substituents with the lowest possible numbers. If the substituents are in equivalent positions, the one that appears first in the name should receive the lower number. Proper application of these rules will clarify the correct numbering for naming the compounds.
Sunwoo Bae
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Homework Statement
Naming the given structures
Relevant Equations
None
When there is both alkyl substituent and ethoxy substituent in a single molecule, which one should be prioritized when numbering your base carbon chains?
I am confused because the first structure below seems to have numbered the carbon attached to ethyl as the first carbon, while the second structure seem to give carbon attached to ethoxy group the lowest carbon number.

Thanks for your help!

1628869912031.png
1628870015320.png
 
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Sunwoo Bae said:
Homework Statement:: Naming the given structures
Relevant Equations:: None

When there is both alkyl substituent and ethoxy substituent in a single molecule, which one should be prioritized when numbering your base carbon chains?
I am confused because the first structure below seems to have numbered the carbon attached to ethyl as the first carbon, while the second structure seem to give carbon attached to ethoxy group the lowest carbon number.

Thanks for your help!

View attachment 287488View attachment 287489
How to name organic compounds using the IUPAC rules...

3. Number the carbons of the parent chain from the end that gives the substituents the lowest numbers. When compairing a series of numbers, the series that is the "lowest" is the one which contains the lowest number at the occasion of the first difference. If two or more side chains are in equivalent positions, assign the lowest number to the one which will come first in the name.

source: http://www.chem.uiuc.edu/GenChemReferences/nomenclature_rules.html
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