00:01
Okay, we have the following structure which we can immediately identify as an ether.
00:15
Now unlike say alcohols or carboxylic acids or ketones or aldehydes, ethers do not have a high priority in the sense that the molecule is named with some sort of ending that indicates ether in the same way that alcohols and all carboxylic acids and in noic acid, right, and ketones and in own aldehydes and in al, right.
00:48
That's not true for ether so what we really do is we treat them as substituents, right, and we pick which side of the ether is smaller and cut that oxygen and the smaller half off of the rest of the molecule, for example cutting there, and treat this entire package as a substituent on the longest chain that we find in the remainder of the rest of the molecule such as one, two, three, four, five carbon chain, for example, right.
01:22
Okay, so that's really how we go about this.
01:26
So what then would be the name of this ether group as a functional group? well we identify what the carbon chain would be like, so for example this looks like an isopropyl group and then we just say like oxide isopro and then we say isopropyl, like rather than isopropyl, we say isoprop and then rather than the il ending we say oxide.
02:13
So this would be an isopropoxide.
02:16
Okay, so now let's redraw this, that got a little messy, and i'm gonna color code our isopropoxide and now let's find our longest chain.
02:36
Well we kind of already did, it's gonna be one, two, three, four, five, but the question is are we going to number it from right to left or left to right, that is, is this one, two, three, four, five, or is it one, two, three, four, five, and so what we're talking about is two, two dimethyl, four isopropoxy, right, if we used green, but if we used red we would have four, four dimethyl, two isopropoxy, right, and in this case since no matter which scheme we go with our lowest number is two, we look at the total, right, and we see two plus two plus four is eight or four plus four plus two is ten and we pick the lower one.
03:48
So we're gonna use the green numbering scheme...