Now, when it comes to naming Ammonium salts, we're going to say the set of rules for naming Ammonium salts are similar to amines plus a modifier ending. Here, we're going to modify the ending from amine, which is what we'd have if we had an amine, to aminium, because it's an ammonium salt now. Just before we use the same naming convention, we designate the numerical locations of substituents. We talk about the location of the nitrogen, which forms the parent chain, and then we have the modified ending. We're going to think of it if it was an amine, it'd end with amine, but because it's a positive nitrogen, it's an ammonium ion. So amine changes to aminium.

So, if we take a look here, it says provide the systematic name for the following ammonium salt. Alright. So step 0 says that if it's symmetrical, we can follow the rules for naming them under common rules. But here it's not symmetrical, so we can ignore step 0. Step 1: if asymmetrical, we have to identify the largest carbon chain connected to the nitrogen atom and name it as an ammonium ion. So, if we take a look here, we have an isopropyl, a methyl, an ethyl, and a cyclopentane ring. The cyclopentane ring is the largest one. So here, we end it with that, so we'd say cyclo cyclopentane. But if it wasn't amine, it would end with amine. But here, we're really just changing the ending to aminium. So that's the end of the name.

Next, we're going to name other alkyl groups alphabetically. Oops. Okay. So, actually, use numerical location to indicate the location of nitrogen. Here, since it's on a ring, we don't have to state 1-cyclopentaminium. We don't have to do any of that stuff because it's on a ring. So we go straight to step 2. Name other alkyl groups alphabetically as N-substituents. If they are identical alkyl groups, use numerical prefixes (di, tri, etc.). Now, this grayed-out box is just something we've always done when it comes to naming, and it's used commas to separate numbers from numbers and uses dashes to separate letters from numbers. Letters are not separated from letters, something we've always done. So it's something you should always have in the back of your mind.

Now let's talk about these N-substituents. So what do we have here? We have methyl, we have ethyl, and we have isopropyl. So in alphabetical order, ethyl first. N-ethyl, then I next, N-isopropyl, N-methylcyclopentanaminium. It will be the name of the structure. I know it's a mouthful in terms of this, but this is the way we'd have to name this particular ammonium salt using the IUPAC naming system.