What is the structure for 3,4-dimethylpent-4-en-1-yne and 2,3-dimethylpent-1-en-4-yne?
1 Answer
These are the same compound.
Explanation:
3,4-Dimethylpent-4-en-1-yne
The base name -pent- tells you that you have a 5-carbon chain.
(from opsin.ch.cam.ac.uk)
The -4-en-1-yne suffixes tell you that there is a
(from opsin.ch.cam.ac.uk)
The 3,4-dimethyl- prefix tells you that there is a methyl group on C-3 and one on C-4.
(from opsin.ch.cam.ac.uk)
NOTE: This is not the correct IUPAC nomenclature.
You number the bonds first, then you add the methyl groups.
-ene takes numbering priority over -yne when there is a choice in numbering.
This could be either -1-en-4-yne or -4-en-1-yne, so we have a choice.
The first ending takes priority, so the correct IUPAC name is 2,3-dimethylpent-1-en-4-yne.