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Topic: nomenclature: 4-bromo-3-pentanol vs. 2-bromo-3-pentanol  (Read 8375 times)

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Offline rleung

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nomenclature: 4-bromo-3-pentanol vs. 2-bromo-3-pentanol
« on: September 11, 2005, 07:20:06 PM »
Hi,

I have a question that asks me to correct nomenclature if they are wrong.  It says that "4-bromo-3-pentanol" is correct, but I do not see why.  I thought it would be named 2-bromo-3-pentanol since that gives the lowest numbers without increasing the number of the -OH functional group.

Thanks.

Ryan
« Last Edit: September 11, 2005, 07:31:20 PM by Mitch »
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Offline Mitch

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Re:nomenclature: 4-bromo-3-pentanol vs. 2-bromo-3-pentanol
« Reply #1 on: September 11, 2005, 07:31:59 PM »
You are right, book is wrong.
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sadak

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Re:nomenclature: 4-bromo-3-pentanol vs. 2-bromo-3-pentanol
« Reply #2 on: September 30, 2005, 12:39:20 PM »
bromine takes presidence over a hydroxyl group, as it would do chlorine, and therefore the lowest number is derived from the carbon to which it is attached.  suggest you look in a simple organic non book for the expaination and ditch the book you are currently reading.
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