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Thread: Need help naming these substances (exam coming up)

  1. #1 Need help naming these substances (exam coming up) 
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    Hello,
    Can someone tell me whether the namings of the following 2 molecules are correct?
    I suppose that the first one is correct and the second one is wrong. The second one should take the chain with max number of double & triple bonds.




    Thank you!


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  3. #2  
    Bullshit Intolerant PhDemon's Avatar
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    Hey, as this is the second question you have asked on IUPAC names this site IUPAC Naming | ChemDoodle Web Components may save you time in future if you have to do this a lot. Give it a go and post the answer. I'd be interested to see if it works and it is tricky to use from my phone.


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  4. #3  
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    The names in the image above were generated by a program called chemdraw.
    Ive used the link you gave me & it gives other results. Can you tell me which ones are right if you know it, because I need to know exactly which ones are correct, because one mistake can ruin the whole name.



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  5. #4  
    Bullshit Intolerant PhDemon's Avatar
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    I'm in the pub and as such not 100% on the ball but I'd go with the ones from the site I gave you as the top one is a hexadiyne (remember last time when I said the principle chain had to include both principle groups) and for the second one IIRC vinyl is not a IUPAC naming stem (I could be wrong in this though).
    Last edited by PhDemon; April 18th, 2014 at 02:45 PM. Reason: typo
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  6. #5  
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    I think you are right on this one. The ones I posted are wrong indeed. I have an exam coming up so thank you for the help!
    Last edited by mcfaker123; April 18th, 2014 at 01:02 PM.
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  7. #6  
    Bullshit Intolerant PhDemon's Avatar
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    No problem, good luck in the exam.
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  8. #7  
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    Quote Originally Posted by mcfaker123 View Post
    I think you are right on this one. The ones I posted are wrong indeed. I have an exam coming up so thank you for the help!
    Don't be to fast on proclaiming it was wrong.

    The first one was correct..

    the second one was

    5-ethenyl-4-ethyldodec-2-yne
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  9. #8  
    Bullshit Intolerant PhDemon's Avatar
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    It's a while since I've done this myself but I'd go with the names in post #3. The top one is a hexadiyne (the principle chain has to include both alkyne groups) and the second one I'd name it with the principle chain containing both the alkyne and alkene groups as in post #3 (but I'm not 100% on that one, if you can find an IUPAC rule that disagrees I wouldn't be that surprised).
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  10. #9  
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    first one is 3-pentyl-4-propyl-hex-1,5-diyne
    second one is 4-ethyl-3-heptyl-hept-1-ene-5-yne we may ignore longest chain rule when there are functional groups in the given compound....
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