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Isomer of butene

  1. Jun 9, 2014 #1
    this website only shows 5 isomer for butene. which is 1-butene, 2-butene(cis and trans), 2-methylpropene, cyclobutane. but i have 1 extra compared to the website which is 1-methyl-propene. I correct or the website correct?

  2. jcsd
  3. Jun 9, 2014 #2


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    Staff: Mentor

    1-methyl-propene is equivalent of either 1-butene or 2-butene. I am not sure of which, as it is not clear to me where do you want to put the methyl.
  4. Jun 9, 2014 #3
    Putting the methyl on the #1 carbon of the propene makes the carbon skeleton 4 carbons long and linear - the same as 2-butene.
  5. Jun 9, 2014 #4
    here's is it. i'm not sure whether the name is correct or not.

    Attached Files:

  6. Jun 10, 2014 #5


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    Staff: Mentor

    And how the structure in your image is different from butene-1?
  7. Jun 10, 2014 #6
    The names seems to be confused about exactly which carbon on the propene skeleton is the #1 carbon.
    By convention, the #1 carbon in propene is the one on the end that has the double bond to its neighbor.
    That said, you have attached a substituent group (methyl) to the #3 carbon, not the #1 carbon.
    If the substituent were anything that did not have a carbon attaching to the propene, then the nomenclature should be somethhing like 3-[substituent]propene.
    For example 3-bromopropene or 3-ethoxypropene.
    Since you have attached another carbon to the 3-carbon chain of the propene, your carbon skeleton is now longer, and the name propene no longer applies.
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