Organic chem, conventions and priorities.

[physics]

carboxy is most important, so the suffix will always be like -oic. if there is a hydoxy group u dont call it alcohol its called .. hydroxy and if its amine, you call it amino as the prefix. all prefix are in alphabetical order, so u can have 1-amino-2-chloro-3,4-dimethybutanoic acid

regardless of hirachy?

[stonecold]

Read this, it should help.
http://depts.uwc.edu/chemistry/helpful_files/nomenclature.pdf

And yeah, as carboxyl is the highest priority functional group, any molecule that contains it must end in the suffix 'oic acid'
A hydoxyl or amine group would be prefrixed as 'hydroxy' or 'amino'

If you have an amine as the highest prioirty functional group however, the suffix MUST be 'amine.'

You can't name it as an alkane or whatever and then put 'amino' as a prefix.  VCAA will mark it wrong!

[physics]

Read this, it should help.
http://depts.uwc.edu/chemistry/helpful_files/nomenclature.pdf

And yeah, as carboxyl is the highest priority functional group, any molecule that contains it must end in the suffix 'oic acid'
A hydoxyl or amine group would be prefrixed as 'hydroxy' or 'amino'

If you have an amine as the highest prioirty functional group however, the suffix MUST be 'amine.'

You can't name it as an alkane or whatever and then put 'amino' as a prefix.  VCAA will mark it wrong!

confused sorry

[stonecold]

Look at this:
http://vcenotes.com/forum/index.php/topic,25206.msg257152.html#msg257152

It's got the examiners report which explains what i'm saying.

Mao also gives a nice explanation.

[kyzoo]

I don't really see functional groups as being prioritized over each other.

A carboxylic acid functional group can only be attached to the end of a carbon chain, hence it's logical that when naming the molecule you start counting from the carboxylic acid group, so that you avoid having to ascribe a number to the carboxylic acid group's position.

[stonecold]

^they are.  if you had a hydroxy and an amino group in the same molecule, you would name it with the suffix 'ol' and not 'amine.'

And the hydroxy group could be anywhere on the molecule...

[macca69831]

Stonecold and annahinh are right

[kenhung123]

The IUPAC basic principles show alkyl group>secondary functional>double bond and they do not mention alkyl halides at all...

[Mao]

Thank you stonecold for linking. Here's the post.

For the sake of VCE, you'll always get fairly simple molecules to make, and it'll be pretty clear which ones are primary and which ones are secondary. So the rule simplifies to:

- Identify the functional group that will be assigned by the suffix
- Number the parent chain in a way to minimize the number of the above functional group
- All other functional groups will be assigned by prefixes, group in alphabetical order

Hence, carboxyl groups (COOH) will always be 1, and the hydroxyl group will always be minimized (for the sake of VCE)

In this case, -OH (hydroxy) takes precedence, it is the primary functional group. Secondary functional groups are chloro, methyl and alkene.

The name here will be 5-chloro-5-methylhex-3-en-3-ol. [Note the use of en, and the numbers are infixes. Between numbers and letters there should be a hyphen, and there are no spaces in a name (except for esters)]

[kenhung123]

What exactly is the priority of secondary functional groups?

[Mao]

What exactly is the priority of secondary functional groups?

It doesn't matter, numbering of the chain happens when you decide on the primary functional group, i.e. OH is numbered 3, thus alkene is also numbered 3.

But if you must know, after where this table ends, the order of precedence goes:

alkene > alkyne > halides > alkyl

Source:
http://commons.wikimedia.org/wiki/File:But-1-en-3-yne.svg - alkene precedence over alkyne
http://www.chemicalbook.com/ChemicalProductProperty_EN_CB4429957.htm - halide precedence over alkane
http://www.chemicalbook.com/ChemicalProductProperty_JP_CB51097071.htm - alkene precedence over halide
http://www.chemicalbook.com/ProductChemicalPropertiesCB7422328_EN.htm - alkyne precedence over halide

[kenhung123]

Oh ok, thanks a lot Mao and Alkyl goes before alkane and after halides?

[Mao]

The 'alkane' group I written there means alkyl groups, I should have been more clear. Alkanes chains (the longest parent chain) has no precedence since it does not require numbering.

[happyhappyland]

Doubt vcaa would get that hardcore about it.

[stonecold]

Okay, so I just want to be clear about naming amines.  

WARNING!  Heinemann book teaches it wrong.  You can not name something aminoethane.  It has to have amine in the suffix in it, so it is actually ethylamine/ethanamine.

What I would like to like confirmed is the following:

For propane with an amine group attached to carbon 1, the name is propylamine/propanamine
For propane with an amine group attached to carbon 2, the name is 2-propylamine/propyl-2-amine/2-propanamine/propan-2-amine

Is this correct?

Also trimethylamine is just a nitrogen with three methyl groups stuck onto each bond in place of a hydrogen yeah?