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Priority in Numbering

Posted: Mon Mar 07, 2016 9:51 am
by David Bui 1C
So is it true that all functional groups except for halogens have the priority for the lowest numbering?

Re: Priority in Numbering

Posted: Mon Mar 07, 2016 9:53 am
by Marvin Lu 1E
This is true. We tend to start the chain at the functional group, however we treat halogens as a substituent. We number and name halogens based off alphabetical order or lowest number chain.

Re: Priority in Numbering

Posted: Mon Mar 07, 2016 11:40 am
by 204408136
Can someone post an example of this?

Re: Priority in Numbering

Posted: Mon Mar 07, 2016 5:06 pm
by rivera_1J
An example of functional groups having priority over halogens is in the course reader page 104
ClCH2CH2CH(OH)CH3 here the alcohol functional group gets numbered as 2 and the chlorine is 4 because functional groups get priority in numbering over substituents and double/triple bonds
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example in course reader