09-12-03 01:41
No 458591
What is the difference? I cant understand
-jsx
(pHantasticant)
09-12-03 01:56
No 458594
R-NH2 = amine
R-(C=O)-NH2 = amide
Point... Counter Point...
(you can always take some more)
09-12-03 02:25
No 458598
Another important difference is that amine groups have acid/base properties, while amides does not!
You can always take some more!
(Hive Bee)
09-12-03 02:27
No 458599
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...
-jsx
(Active Asperger Archivist)
09-16-03 08:21
No 459408
replace the -NH2 in the AMIDE structure above with a -OH and you have an ester.
Act quickly or not at all.
(Hive Bee)
09-17-03 04:01
No 459587
That wouldn't be a carboxylic acid?
-jsx
(you can always take some more)
09-17-03 04:13
No 459588
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
Regards
Bandil
You can always take some more!
(Hive Bee)
09-18-03 05:39
No 459755
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..
-jsx
(Active Asperger Archivist)
09-18-03 23:35
No 459897
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?)
Act quickly or not at all.