What is the structure for 3,4-dimethylpent-4-en-1-yne and 2,3-dimethylpent-1-en-4-yne?

Answer 1

Ryan Andrews

These are the same compound.

3,4-Dimethylpent-4-en-1-yne

The base name -pent- tells you that you have a 5-carbon chain.

double bond between #"C-4"# and #"C-5"# and a #"C≡C"# triple bond between #"C-1"# and #"C-2"#.

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.

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Answer 2

Carter Allen

The structure for 3,4-dimethylpent-4-en-1-yne is CH₃-C≡C-CH(CH₃)-CH₂-CH₃. The structure for 2,3-dimethylpent-1-en-4-yne is CH≡C-CH(CH₃)-CH(CH₃)-CH₂-CH₃.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.