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Posted: Fri Mar 10, 2017 2:33 am
In the quiz 1 preparation in the course reader, what makes the name of the substituent 4-isopropyl as opposed to just 4-propyl?
Posted: Fri Mar 10, 2017 8:23 am
It has "iso" because of its formation. The two carbons are connected to one at the same time rather than each connected to one another.
If it was connected to each other like C--C--C in a chain, then you would call it propyl, but since it's 2 carbons connected to one, then it's isopropyl. You can also call it "secpropyl" I believe
Posted: Fri Mar 10, 2017 12:50 pm
The prefix "iso" refers to the structural arrangement of the subsistent group around the carbon. In this example, "iso" is used because the substituent is attached at one end and branches at the other, forming a Y-like shape.
Posted: Fri Mar 10, 2017 2:22 pm
Building on the previous replies, it may be useful to know that iso- prefixes generally occur when the substituent is on the second carbon in the parent chain.