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Organic chem question...

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thejackamo
Posts: 1785 - Karma: 11
this one's weird. it's an alkyane, but i have no idea where to start numbering:

Click for larger image

any help would be appreciated
Jun 1 2006 1:43AM
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.David.
Posts: 1273 - Karma: 12
3,5-dimethyl-4-chloro heptane

made chlorine be at the smallest number since its the only substituent.. so you'd start counting at that carbon upper right.. or lower right which ever.. that was probably confusing...
Jun 1 2006 1:56AM
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.David.
Posts: 1273 - Karma: 12
*make.. not made
Jun 1 2006 1:56AM
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.David.
Posts: 1273 - Karma: 12
oh wait... i messed up..

it would be

3-methyl, 5-dimethyl, 4-chloro heptane
Jun 1 2006 2:02AM
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Itsbackfliptime
Posts: 18901 - Karma: 75
I'm so glad I don't have to take orgo.
Jun 1 2006 2:05AM
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thejackamo
Posts: 1785 - Karma: 11
oh, it's not a class, it's just the tail end of AP chem this year. he's barely even teaching it as it is cause there's too much to cover, so he's just giving us a super condensed version.

and based on where it started, wouldn't it be: 3,5,5-trimethyl-4-chloroheptane?
Jun 1 2006 2:09AM
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.David.
Posts: 1273 - Karma: 12
yeah.. you are right.

i wrote it down wrong...

I like ochem.. it can be fun.
Jun 1 2006 2:11AM
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thejackamo
Posts: 1785 - Karma: 11
yeah once you get nomenclature down it can be fun for sure.

i'm good with molecular structures, lewis structures, stochiometry in general. everything else takes a while, but once it all falls in to place it's so gratifying.
Jun 1 2006 2:15AM
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Chubby.Chaser
Posts: 2926 - Karma: 15
i think 1,1,5-trimethyl-4-chloro-heptane

first find the longest continuous chain of carbon, which is 7(heptane), then draw the molecule like a straight line, that can make it easier to do the numbering

you should start numbering at the end that would give you the lowest number, ie if you had only one group, at the end of the chain put that as the 1st carbon, not the 7th or whatever number carbon
Jun 1 2006 12:05PM
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Chubby.Chaser
Posts: 2926 - Karma: 15
i could be completely wrong though, it's been two years since i've done any high school organic chemistry
Jun 1 2006 12:08PM
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Chubby.Chaser
Posts: 2926 - Karma: 15
3,5,5-trimethyl, sorry you were correct
Jun 1 2006 12:09PM
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sKILOve07
Posts: 3482 - Karma: 9
just look at your reference table, it has all the helpful little things you need to know.
Jun 1 2006 1:32PM
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