00:01
The goal with assigning an iupac name or a systematic name is to get an unambiguous name that matches the structure and only that structure.
00:14
So the first thing we need to do is identify the parent chain, which typically is the longest continuous or consecutive string of carbons in the structure.
00:26
So in this top structure we could identify this 10 carbon piece as the longest chain, in which case there's one branch that's coming off that chain and we would we want to number the chain in the direction that gives us the lowest locants.
00:53
So in this case numbering the carbons from left to right puts the branch at carbon 5 whereas if we numbered from right to left it would put it at carbon 10 or sorry carbon 6.
01:13
So our parent name is going to be for 10 carbons, which is decane.
01:20
Then we have a 5 carbon branch.
01:23
The 5 carbon branch is connected at the third carbon.
01:31
So say 5 then in parentheses pent 3 yield.
01:47
So it's a pentyl group and the 3 is indicating that the branch point is the third carbon of the pentyl.
02:02
The parent name is decane for 10 carbons.
02:07
So 5 pent 3 yield decane would be an acceptable name.
02:13
Now we could also label it differently where we go with a shorter chain and have two branches.
02:23
It would not be ideal because the longest chain would be for the parent name would not be the longest chain in the structure, but it would make some ease of naming with the prefixes.
02:39
So if we were to take the parent chain in that direction we would have an 8 carbon chain with two branches on it...