The preferred IUPAC name for the compound above is hept-1-en-6-yne. I understand that the numbers are chosen in order to give the alkene the lower locant, as explained in Should double or triple bonds have preference for low locants in IUPAC nomenclature?.
However, I'm wondering why the name has the form -en-yne instead of -yn-ene. In other words, why is it not "hept-6-yn-1-ene" instead?
Furthermore, if this is an IUPAC specification, is there any rationale for why en-yne should be preferred to yn-ene?
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