The Vespiary

The Hive => Newbee Forum => Topic started by: jsorex on September 12, 2003, 01:41:00 AM

Title: Amine, amide
Post by: jsorex on September 12, 2003, 01:41:00 AM

What is the difference? I cant understand

Title: Amide vs. Amine
Post by: pHarmacist on September 12, 2003, 01:56:00 AM

R-NH2 = amine

R-(C=O)-NH2 = amide

Title: Another important difference is that amine...
Post by: Bandil on September 12, 2003, 02:25:00 AM

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

Title: That I actually knew.
Post by: jsorex on September 12, 2003, 02:27:00 AM

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...

Title: ester
Post by: Aurelius on September 16, 2003, 08:21:00 AM

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

Title: ?
Post by: jsorex on September 17, 2003, 04:01:00 AM

That wouldn't be a carboxylic acid?

Title: Esters
Post by: Bandil on September 17, 2003, 04:13:00 AM

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

for more details!

Regards
Bandil

Title: Thanks for the link. Can you believe that I...
Post by: jsorex on September 18, 2003, 05:39:00 AM

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..

Title: Sorry
Post by: Aurelius on September 18, 2003, 11:35:00 PM

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?) :-[