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    1,3-dimethylcyclopropane

    The name is wrong- what is the correct name of the structure??

    Help please- I will give you rep - thanks
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    1,2-dimethylcyclopropane

    EDIT: The methyl groups must be on the first and second carbons. It is a cyclic compound, so the first and third carbons (1,3) are the same as the first and second carbons (1,2).
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    Cyclopropane = 3 membered ring so the highest number can only be 2

    1,2-dimethylcyclopropane I guess?
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    (Original post by Elm_lily)
    1,3-dimethylcyclopropane

    The name is wrong- what is the correct name of the structure??

    Help please- I will give you rep - thanks
    Draw the structure first. Then use your nomenclature skills to identify it.
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    Yeah, good point above. OP, what does it look like? Have a picture by any chance?
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    There can be several names one being 3,3-Dimethyl-cyclopropane-1
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    (Original post by jonathan3909)
    There can be several names one being 3,3-Dimethyl-cyclopropane-1
    You what? What does THAT look like? I think the OP is concerned with one structure, so providing isomers isn't going to be too helpful. That name you've produced doesn't follow IUPAC rules.

    EDIT: yeah, post below confirms your suggestion is wack.
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    OP is it this:

    If so that's 1,2-dimethylcyclopropane, you use the shortest numbering system. Are they giving you any stereochemistry (bonds pointing towards or away)?

    (Original post by jonathan3909)
    There can be several names one being 3,3-Dimethyl-cyclopropane-1
    Popping that into ChemDraw gets nothing. Don't think that's fully correct...
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    (Original post by Preasure)
    Popping that into ChemDraw gets nothing. Don't think that's fully correct...
    *googles ChemDraw*

    Oh wow :eek: I gotta get me a copy of that!
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    (Original post by Iapetus)
    You what? What does THAT look like? I think the OP is concerned with one structure, so providing isomers isn't going to be too helpful. That name you've produced doesn't follow IUPAC rules.
    It's (1R,3R)-1,3-dimethylcyclopentane

    http://pubchem.ncbi.nlm.nih.gov/summ...cgi?sid=116125

    Try http://www.chemicalize.org/ and check your diagram there
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    (Original post by Iapetus)
    *googles ChemDraw*

    Oh wow :eek: I gotta get me a copy of that!
    If you're at uni they may have a site licence so you can download it for free. There's other drawing packages avaliable too.

    http://www.symyx.com/micro/getdraw/ may work, since you're not at uni yet.

    Or look on http://en.wikipedia.org/wiki/Chemica...rawing_program
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    (Original post by Preasure)
    If you're at uni they may have a site licence so you can download it for free. There's other drawing packages avaliable too.

    http://www.symyx.com/micro/getdraw/ may work, since you're not at uni yet.

    Or look on http://en.wikipedia.org/wiki/Chemica...rawing_program
    Oooh thankee

    +ve rep for you
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    (Original post by Elm_lily)
    1,3-dimethylcyclopropane

    The name is wrong- what is the correct name of the structure??

    Help please- I will give you rep - thanks
    I think it's 2,4-dimethylcyclopropane
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    (Original post by jonathan3909)
    It's (1R,3R)-1,3-dimethylcyclopentane
    )
    IUPAC Rule A6-1.2:When there is no generally recognized trivial name for the hydrocarbon, then (1) the radical name denoting the aliphatic chain is prefixed to the name of the cyclic hydrocarbon, or (2) the radical name for the cyclic hydrocarbon is prefixed to the name of the aliphatic compound.

    Choice between these methods is made according to the more appropriate of the following principles: (a) the maximum number of substitutions into a single unit of structure; (b) treatment of a smaller structure as a substituent into a larger.

    61.3 - In accordance with the principle (a) of Part .2 of this rule, hydrocarbons containing several chains attached to one cyclic nucleus are generally named as derivatives of the cyclic compound; and compounds containing several side chains and/or cyclic radicals attached to one chain are named as derivatives of the acyclic compound.

    http://www.acdlabs.com/products/name...l#nomenclature

    1,2-dimethylcyclopropane
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    I was always told by my chemistry teacher that you're never going to come across cyclopropane... Apparently its ridiculously unstable, and hardly worth the bother storing, because it does practically nothing except break down.
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    2,4 Dnp
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    (Original post by Asha5692)
    I think it's 2,4-dimethylcyclopropane
    You cant have a 4th carbon when theres only 3 in the ring :P
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    (Original post by Scarletsmoke)
    I was always told by my chemistry teacher that you're never going to come across cyclopropane... Apparently its ridiculously unstable, and hardly worth the bother storing, because it does practically nothing except break down.
    On the contrary, it's used as an anaesthetic...

    http://www.general-anaesthesia.com/cyclopropane.html
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    (Original post by Scarletsmoke)
    You cant have a 4th carbon when theres only 3 in the ring :P
    Oh crap!! LOL.. yeah... I was thinking of a benzene ring...
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    (Original post by Iapetus)
    1,2-dimethylcyclopropane

    EDIT: The methyl groups must be on the first and second carbons. It is a cyclic compound, so the first and third carbons (1,3) are the same as the first and second carbons (1,2).
    Thanks... realised the answer after I had posted this. I'm just learning the rules of organic chemistry
 
 
 

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