Help
Sign In »
Register Now!
I need some help with this please :why the OCCl2 does not have resonance?
how to know if a compound has resonance or not ?
Welcome to ScienceForums.Net!
|
Welcome to ScienceForums.Net! We welcome science discussion at all levels — from beginners to researchers, covering topics from biology to computer science, and much more. Registration is fast and free, and allows you to post on the forums, so register now and join the discussions! After you've registered, come in and introduce yourself, or visit the forum index. If you need any help registering, posting, or if you just have some questions about our site, please feel free to contact us at staff at scienceforums dot net.
|
|
| Guest Message © 2012 DevFuse | |
Page 1 of 1
resonance
resonance of compounds
Rate Topic:
#2
10 January 2012 - 01:35 PM
Suxamethonium 
Baryon
Im going to assume OCCl2 is phosgene.
Whilst this is not the be all and end all of resonance- a good hint to finding resonating structures is looking for double bonds, particularly double bonds with adjacent single bonds. An example is acetone, H3CC(=O)CH3 -You may want to draw it.
In an acid or base, protonation of the oxygen or deprotonation of a carbon occurs, and a charge is established. This is important because now electrons can flow through the molecule. Where the electrons flow single bonds become double bonds, and the double bonds become single bonds. This is because of the electrons moving in pi-orbitals. In order for this to happen there needs to be some degree of conjugation, unless its only moving through 1 bond.
In the acetone example, H3CC(=O)CH3 resonates to H2C=C(OH)CH3.
Likewise through conjugation:
-O-CH=CH-CH=CH-CH=O could resonate to O=CH-CH=CH-CH=CH-O-
As for phosgene, It doesn't resonate because theres no where for electrons come from.
O=CCl2 does not go to -O-C(=Cl+)Cl - it deosnt look right for starters, and its too unfavourable to take electrons away from chlorine.
I'm struggling to explain it in text, can you present a few, more sepcific questions of what you don't quite understand? Maybe it will be easier for me to answer clearly.
Whilst this is not the be all and end all of resonance- a good hint to finding resonating structures is looking for double bonds, particularly double bonds with adjacent single bonds. An example is acetone, H3CC(=O)CH3 -You may want to draw it.
In an acid or base, protonation of the oxygen or deprotonation of a carbon occurs, and a charge is established. This is important because now electrons can flow through the molecule. Where the electrons flow single bonds become double bonds, and the double bonds become single bonds. This is because of the electrons moving in pi-orbitals. In order for this to happen there needs to be some degree of conjugation, unless its only moving through 1 bond.
In the acetone example, H3CC(=O)CH3 resonates to H2C=C(OH)CH3.
Likewise through conjugation:
-O-CH=CH-CH=CH-CH=O could resonate to O=CH-CH=CH-CH=CH-O-
As for phosgene, It doesn't resonate because theres no where for electrons come from.
O=CCl2 does not go to -O-C(=Cl+)Cl - it deosnt look right for starters, and its too unfavourable to take electrons away from chlorine.
I'm struggling to explain it in text, can you present a few, more sepcific questions of what you don't quite understand? Maybe it will be easier for me to answer clearly.
- Posts: 153 | Joined: 30-December 11
Reply
Share this topic:
Page 1 of 1