Amine, amide

[jsorex]

What is the difference? I cant understand

[pHarmacist]

R-NH2 = amine

R-(C=O)-NH2 = amide

[Bandil]

Another important difference is that amine groups have acid/base properties, while amides does not!

[jsorex]

That I actually knew. Theese structures are hard to remeber, I aleays fotget and confuse them. I can't remeber what an ester is anymore, for fucks sake, i mean the structure again...

[Aurelius]

replace the -NH2 in the AMIDE structure above with a -OH and you have an ester.

[jsorex]

That wouldn't be a carboxylic acid?

[Bandil]

jsorex> Yes, that would be a carboxylic acid.

An ester is an carboxylic acid bound to an alchohol with and condensation reaction(ie. you loose a molecule of water).

Thus an ester looks like the following

R-(C=O)-O-R

Which has been formed via. the following two molecules:

R-(C=O)-OH + HO-R + (H+) -----> R-(C=O)-O-R + H2O + (H+)
This reaction is called a Fischer esterfication, and is acid catalysed.

It is the -OH group from the carboxyl acid, that get's knocked off.

But there are several other ways of forming esters.

Check out:

http://www.people.virginia.edu/~fac6q/19_13_17.pdf

for more details!

Regards
Bandil

[jsorex]

Thanks for the link. Can you believe that I passed a 4 ECTS course on organic chemistry with the second best grade and our university is within the top 5 of th EU! Because I can't..

[Aurelius]

My bad- wasn't thinking.  I've really got to start getting more sleep.  (we all say this, but do we ever really do anything about it?)