What Factors Influence the Basicity Order of Substituted Anilines?

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Discussion Overview

The discussion revolves around the factors influencing the basicity order of substituted anilines, focusing on the effects of different substituents in the ortho, meta, and para positions. Participants explore theoretical explanations and seek clarification on the observed basicity trends.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the basicity order of substituted anilines, specifically why p-methyl aniline is more basic than ortho and meta substituted anilines, suggesting that ortho substitution should enhance basicity due to hyperconjugation and inductive effects.
  • Another participant raises a query about the basicity order involving nitro substituents, asking why ortho nitro aniline is the least basic, proposing that it might be due to the orientation of the NH2 group affecting resonance.
  • There is a request for clarification on whether the ortho effect applies to all substituents, indicating uncertainty about its general applicability.

Areas of Agreement / Disagreement

Participants express differing views on the basicity trends and the influence of substituents, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Limitations include potential missing assumptions regarding the definitions of basicity and the specific effects of substituents, as well as unresolved questions about the ortho effect's applicability.

Who May Find This Useful

Readers interested in organic chemistry, particularly those studying the effects of substituents on the basicity of amines and related compounds.

sachin123
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Hey folks.
The orders given are stated in my book.I'm here to ask why.

basicity: p-methyl aniline>m-()>aniline>o-()
p exerts hyperconjugation and +I,m only +I ,but ortho exerts hyperconjugation and higher +I.
Shouldn't o-methyl aniline have high basicity?

basicity: aniline>m-nitro()>p-nitro()>o-nitro()
Why is o- at last?Shouldn't it move NH2 out of plane so that no -R takes place?

And is the ortho effect applicable to all substituents?Can you clear this for me?
Thank You.
 
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PLease tell me if my post isn't clear(and where).
 
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