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Topic: what's the difference between these 2 names?  (Read 2526 times)

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Offline ghassan054

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what's the difference between these 2 names?
« on: March 23, 2011, 12:17:12 PM »
I cam across this name while studying for an exam:

1,6-dicyclobutyl-7-cyclopropyl-2,4-diisobutylcyclooctane

when I drew the compound, I wondered why I shouldn't name it as follows:-

1,4-cyclobutyl-2-cyclopropyl-5,7-diisobutylcyclooctane

can someone explain which one is correct?
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Offline orgstudy

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Re: what's the difference between these 2 names?
« Reply #1 on: March 23, 2011, 01:54:19 PM »
I'm no expert but i think you are right about numbering ...
it gives a smaller total
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Offline Doc Oc

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Re: what's the difference between these 2 names?
« Reply #2 on: March 23, 2011, 07:48:16 PM »
Isobutyl groups are larger than cyclopropyls so they take priority.  You number the system to keep the larger substituents with the lowest numbers.
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Offline orgstudy

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Re: what's the difference between these 2 names?
« Reply #3 on: April 05, 2011, 12:02:06 PM »
so b/w
"lowest sum rule" and "larger groups with smaller number"
the latter has higher priority?
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