Linked Questions

7
votes
2answers
23k views

What is the priority for numbering alkyl side chains?

I'm wondering why the above image is named 5-ethyl-3,3-dimethylheptane rather than 3-ethyl-5,5-dimethylheptane. I thought an ethyl substituent has a higher priority (I know this is true when arranging ...
15
votes
1answer
631 views

Alphabetization rule in case of consecutively placed substituents

This is the compound: I am stuck on assigning the locants to the given halo substituents. We know that all halogens are of equal priority. So, using first point of difference, we get either an $\ce{I ...
8
votes
1answer
4k views

Nomenclature of a cyclohexyl ether and locant position enumeration

As far as I know, 'ethoxy' should be given the locant '1' as it is a functional group. The compound should thus be named 1-ethoxy-2,2-dimethylcyclohexane. However, I was told that the correct name is ...
1
vote
2answers
1k views

What is the correct IUPAC name of this compund?

I thought C=C is the "functional group" here and Br is a substituent so the numbering should start from the top left C, making the name 4-Bromo-3-methylbut-2-ene, but my book says 1-Bromo-2-methylbut-...
-2
votes
2answers
4k views

IUPAC nomenclature for many multiple bonds in an organic compound molecule

My previous Chemistry teacher while teaching IUPAC nomenclature said that the double bond is always given greater priority over the triple bond and the numbering of the carbon atom chain is done in ...
1
vote
1answer
403 views

Nomenclature of an alkyne with bromo and hydroxy substituents

Is the IUPAC name of above compound 7,7-dibromo oct-5-yn-4-ol or 2,2 dibromo oct-3-yn-5-ol ? I understand that the former name is given keeping in mind -OH as the functional group but by giving the ...
3
votes
1answer
482 views

Naming tetrahalogenated benzene

ChemSketch generates the IUPAC name of the compound above as "2-bromo-1-chloro-5-fluoro-3-iodobenzene" but I have a different answer. I know that I have asked a related question before as well. The ...
1
vote
1answer
229 views

Clarification of IUPAC name [duplicate]

Is the IUPAC name of $\ce{CH3CH=CH-C#CH}$ pent-3-en-1-yne or pent-2-en-4-yne?
-1
votes
1answer
336 views

Naming a hydrocarbon chain with multiple substituents equidistant from both terminals

Does the substituent that comes alphabetically first take precedence, or do we look for the next nearest substituent, or is it a combination of both?
0
votes
1answer
314 views

Clarification on IUPAC nomencalture

This is 1,6-dimethyl-cyclohexene. Why cannot this same structure have the IUPAC name 1,2-dimethyl-cyclohexene. In the given picture the locant sum comes to 7 but in my case it comes to 3, implying ...
0
votes
3answers
639 views

First point of difference rule 1,6-dimethylcyclohex-1-ene [duplicate]

According to the first point of difference rule, second one should be correct right?
0
votes
1answer
97 views

IUPAC nomenclature of organic compound

I strongly feel that the answer should be option (1) as the ester functional group has a greater preference over the double bond and hence it should get a lower locant. But the source of the question ...
0
votes
1answer
32 views

IUPAC Name clarification [closed]

$\ce{CH3-CH(F)-CH2-CH2-CH(C2H5)-CH2-CH3}$ Will the correct IUPAC name be 3-ethyl 6-fluoro heptane or 5-ethyl 2-fluoro heptane?