2-Iodobutane  [ENDORSED]

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Kristen Hazama 1I
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Joined: Wed Nov 18, 2015 3:00 am

2-Iodobutane

Postby Kristen Hazama 1I » Sun Mar 05, 2017 12:06 am

2-Iodobutane is included in our course reader, but I don't believe Dr. Lavelle mentioned it in class. Can someone explain why Iodine is on the 3rd Carbon, but its name is 2-Iodobutane?

Cherry_Deng_1K
Posts: 12
Joined: Wed Sep 21, 2016 2:55 pm

Re: 2-Iodobutane  [ENDORSED]

Postby Cherry_Deng_1K » Sun Mar 05, 2017 12:33 am

Hello,

If you recall the rules for numbering the carbons, you assign the smallest number possible to the substituent. If you look at CH3CH2CHICH3 from left to right, it would be 3-iodobutane, but 3 is bigger than 2. In the case of 2-iodobutane, you can number the carbons from right to left in order to give the substituent the smallest number possible, which is 2. The "third carbon" would then actually be the second carbon. This is why it is called 2-iodobutane. Hope this makes sense!


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