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mesomeric effect?!?!

can someone please explain this? I don't understand it at all!
Original post by 24601jvj
can someone please explain this? I don't understand it at all!


... as in electron density being increased in an aromatic ring, activating and directing towards 2,4,6 positions?
Hi

If this is for a-level then you just have to understand the activating or deactivating effect of certain groups. If you wish to know specifically about the mesomeric effect then you need to look up resonance structures for rings and look for groups that are ortho, meta and para directors and why, be ready with your curly arrows!

Alex

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