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Topic: Semi-structural formulae confusion  (Read 1814 times)

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Offline johnsy123

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Semi-structural formulae confusion
« on: June 12, 2011, 03:39:08 AM »
Hey everyone. I was wondering why the semi structural formulae of 2 methly pentan-1-ol is CH3CH2CH2CH(CH3)CH2OH and not CH3CH(CH3)CH2CH2OH.

-How do you know which end to start from when your counting the carbons in these problems?
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Online Hunter2

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Re: Semi-structural formulae confusion
« Reply #1 on: June 12, 2011, 05:33:19 AM »
You have to find the longest chain, then the number 1 is the C-atom which carries the hetero atom, here the OH- group. The other law is if no hetero atoms in the molecule to have the numbers to small as possible.
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