course reader page 96 neo and tert

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terdaf
Posts: 11
Joined: Fri Sep 25, 2015 3:00 am

course reader page 96 neo and tert

Postby terdaf » Tue Mar 07, 2017 6:48 pm

Can someone explain why we use -tert- instead of -neo- in the example for 2 substituents on ring on page 96 of course reader? Arent three CH3s attached to a C described by the "neo" structure?

Fengting Liang 1F
Posts: 23
Joined: Sat Jul 09, 2016 3:00 am

Re: course reader page 96 neo and tert

Postby Fengting Liang 1F » Tue Mar 07, 2017 8:37 pm

I think it's because there has to be 4 C-C connections on the attached group to be able to use the prefix "neo". So if you ignore the hexane and the line connecting the butyl to the hexane, there are only 3 C-C connections (which is why you use the prefix for 3, "tert"), because butyl only has 4 carbons.

samuelkharpatin2b
Posts: 55
Joined: Wed Sep 21, 2016 2:57 pm

Re: course reader page 96 neo and tert

Postby samuelkharpatin2b » Wed Mar 08, 2017 5:50 pm

You use the prefix neo- when a substitutent has AT LEAST 5 carbons. If the substitutent is composed of fewer than 5 carbons, you cannot use the prefix neo-. Tert-butyl for instance looks similar to neo-(something) in drawings, but due to the number of carbons, you wouldn't use neo-.

Eric_pierce_3E
Posts: 13
Joined: Wed Sep 21, 2016 2:55 pm

Re: course reader page 96 neo and tert

Postby Eric_pierce_3E » Fri Mar 10, 2017 4:50 pm

This was a helpful thread! Thank you!


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