What is the Difference between neo-butyl …
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Sia ? 2 years, 11 months ago
A neo group is a group that has three methyl groups at the end and AT LEAST five carbons total, ie there is a secondary carbon connecting the branching side chain to the main chain. A tert-butyl group is a branching side chain that contains three methyls at the end and connects to the main chain via the tertiary carbon (once it is bonded to the chain, it is quaternary). The tert-butyl group is a sub-class of the neo branching. If you look at the example again, you will see that tert-butyl has FOUR carbons not five and thus could not be neopentyl. You should have the lowest possible sum of the positions of the substituents. This works for the example on page 68 as well.
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