[macman104]

I was under the impression that tert-butyl would be refered to as 2-methylpropyl not 2,2-dimethylpropyl.  2,2-dimethylpropyl would be a chain of 3 carbons with 2 methyl groups at the 2 position.  You would have to name it 1,1-dimethyl-ethyl, but that isn't correct either because you now are no longer selecting the longest chain which is the first step in getting the base name of the group/compound of interest usually.  2,2-dimethylpropyl would be the compound C(CH3)4 which isn't what we have.  We have -C(CH3)3.  I could be wrong since I am a few years removed from my naming practice, but this is correct.

*headdesk* you are 100% correct.  It would not be 2,2-dimethylpropyl.  Apologies.

[saidinstouch]

It's all good, studying for my chemistry gre so I figure trying to help out and recall things I should remember is the a valuable asset in the studying process instead of only reading 3 years worth of chemistry in a month.