Why is -OCH3 more strongly activating than -CH3 in electrophilic aromatic substitution? Facts I know: 1) More the electron density in benzene ring, the faster the reaction. 2) Lone pair on -OCH3 group undergoes resonance and makes ortho-para positions electron rich, and so does -CH3 by hyperconjugation.
Full Answer
Which is more activating OH or OCH3?
One may also ask, which is more activating OH or och3? And for mesomeric effect they are both almost same activating, but if you consider small R groups like CH3, and corresponding inductive effect then OH is likely to be more activating through -I.E. relative to the -I.E. of OCH3 despite CH3 being a +I.E.
Does OCH3 undergo resonance?
2) Lone pair on -OCH3 group undergoes resonance and makes ortho-para positions electron rich, and so does -CH3 by hyperconjugation. Click to see full answer. Beside this, is och3 activating or deactivating?
Is OCH3 electron rich or electron donating?
2) Lone pair on -OCH3 group undergoes resonance and makes ortho-para positions electron rich, and so does -CH3 by hyperconjugation. Moreover, is och3 electron withdrawing or donating? OCH. Resonance is due to the lone pair present on the oxygen make it electron donating group.
What is the inductive effect of OCH3?
This permanent state of polarisation is called the inductive effect. Since oxygen (in -OCH3) is more electronegative than carbon so it will show -I effect that is electron withdrawing. Subsequently, question is, is och3 a strong activator?
Is OCH3 a strong activating or deactivating?
Common activating groups (not a complete list): Alkyl, NH2, NR2, OH, OCH3, SR. Common deactivating groups (not a complete list): NO2, CF3, CN, halogens, COOH, SO3H.
Is OCH3 an activator?
Methoxy group (och3) is an electron-withdrawing group and hence is it is a deactivator.
Is OCH3 more activating than CH3?
Why is -OCH3 more strongly activating than -CH3 in electrophilic aromatic substitution? Bookmark this question. Show activity on this post. Facts I know: 1) More the electron density in benzene ring, the faster the reaction.
Which is more activating group OH or OCH3?
OCH3 or OH and why? OH (hydroxy) has a better +R effect than OCH3 because The -CH3 group in -OCH3 causes steric repulsions with lone pairs, increasing bond angles. Due to which it make -O- atom of -OCH3 more electro-negative and thus affecting donor tendency.
What effect does OCH3 shows?
Here, the oxygen (in OCH3) is more electronegative than carbon due to which it will show -I effect which is electron-withdrawing. On the other hand, OCH3 will lose or release electrons through resonance showing +R effect. Resonance mainly occurs as there is only a lone pair that is present on the oxygen.
Is OCH3 meta directing?
As it turns out, the ortho and para positions for the two groups are the same. The aldehyde group is electron-withdrawing and meta-directing. Okay, this one isn't so clear. Both –OCH3 and –Ph are activating, ortho-/para-directing groups.
Is OCH3 a strong nucleophile?
So OCH3− is a weaker nucleophile than the hydroxide ion in a protic solvent though OCH3− is a stronger base.
Which is more activating NH2 or OCH3?
-NH2 will give more electron density than it takes, and thus -NH2 is an electron donating group.
Why is a methoxy group more activating than a methyl group?
Why is a methoxy group more activating than a methyl group? O It creates a fourth resonance structure in the sigma complex O It directs to the ortho-meto configurations O Its stericinteraction enhances the regloselectivity towards lower energy configurations O Its induction effects amplify the activation.
Why is OCH3 weaker +R group than OH?
−OCH3 group has weaker +R group than −OH. In −OH group lone pair of Oxygen are easily available which in −OCH3 group, the path is hindered due to CH3 group or it can be the +I effect of CH3 group on oxygen atom that is little unstable than −OH group.
What functional group is OCH3?
Methoxy groupA methoxy group is the functional group consisting of a methyl group bound to oxygen. This alkoxy group has the formula O–CH3.
Which is more acidic NO2 or OCH3?
Correct order of acidic strength OH OH OH NO2 (1) OCH3 (III) (2) || > III > (1)> |> III (3) I > III > 11. Was this answer helpful?