Alkane Common and Systematic Naming (Part 3 of Alkane Naming)

I... am sorry for not posting anything in a while. I get lazy when I have to type something in code or just something long. Just in advance, I haven't done the nomenclature for cycloalkanes yet. I will do that... soon, after this.

Let's say I have Butyl cyclo hexane. Let us break it down. Butyl cyclohexane, $\Rightarrow$ Six carbon chain. Oh, but we have cyclo $\Rightarrow$ A ring of carbon chain.

And we have the butyl, hence a four carbon chain branches off.

which is... Butylcyclohexane

Now wait a moment. I could've done this just as easily. Butylcyclohexane2

They're both fundamentally two different structures! We have two ways of differentiating (not calculus differentiation :P) these two molecules.

Common Naming.

If I simply say butyl cyclo hexane $\Rightarrow$ then it's this one. Butylcyclohexane

The second one I drew would definitely be a cyclo hexane however, then ring is bonded to a carbon which is bonded to two other carbons $\Rightarrow$ sec butylcyclo hexane or sometimes in textbooks they write it as s-butyl cyclo hexane.

And the sec means the ring or whatever is attached to a carbon which is attached to two other carbons.

Now think of a situation like this. Butylthing3 I guess I could say that the ring is attached to a carbon and it branches off later separately.

We call this an iso butylcyclo hexane. Think of it like the main chain is attached to a carbon which is away from the branching off part. (Hope that helped... somehow).

And then the last one, Butyltert We have a situation where the ring is bonded to a carbon which is bonded to three other carbons. Hence, it is called tert butylcyclo hexane or t-butylcyclo hexane.

Systematic Naming.

Let's look at the sec butyl cyclo hexane and see how it will be named systematically.

So first of all, the group that comes off the cyclo hexane. Secbut Secbut It is a three carbon group with a methyl group attached.

In other words, 1 methyl propyl. 1 - for being attached to the first carbon of the propyl group. Methyl because it is just one carbon.

That... is just the name of that group that branches off the main carbon ring. And we put the branching group's name in brackets (I think...).

Hence it becomes, (1-methyl propyl) cyclo hexane.

Now this one... 2-methylthing

Now, the methyl group branches off the second carbon $\Rightarrow$ 2-methyl and the whole group is a propyl/three carbon group $\Rightarrow$ 2-methyl propyl.

That's just the side group, we need to name the whole molecule!

And of course, it's still cyclo hexane $\Rightarrow$ (2-methyl propyl) cyclo hexane.

Lastly, terty terty.

Ahaha, this is interesting. So we have two methyl groups attached to an ethyl group. And both of those methyl groups are bonded to the first carbon of the ethyl group.

So we write, di methylethyl. But we gotta show which carbon those methyl groups are bonded to $\Rightarrow$ 1,1 - di methyl ethyl.

Of course that's not the end of it, we have to name the whole molecule!~

Thus, it becomes... (1,1 - di methyl ethyl) cyclo hexane.

I haven't done a note on how to name carbon rings yet... I think you guys get the idea. But I'll write another note or so if you found this confusing.

Feel free to comment on any questions, queries etc. I am writing this post at 2:33 am... So it's likely that I might have made a few mistakes. If so, feel free to correct me.

^^ That is all.

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Alkane Common and Systematic Naming (Part 3 of Alkane Naming)

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