Notes according to syllabus of SET for Assistant Professor Conducted by Savitribai Phule Pune University state Agency (Formerly University Of Pune). Notes for paper I and Chemical Science.

Breaking

Showing posts with label Steric Inhibition of Resonance. Show all posts
Showing posts with label Steric Inhibition of Resonance. Show all posts

Saturday 4 May 2019

May 04, 2019

Steric inhibition of resonance

Steric Inhibition of Resonance

       Resonance inhibition effect on 
1) Physical properties
2) Acidity & basicity &
3) Reactivity of the compounds

 1) Physical properties & steric inhibition of the resonance: 

i) Bond length & bond strength:

       Resonance increases bond length with double bond & decreases with single bond.
  
 C一N bond is more because both type of bond single & double bond involved in resonance. But in following structure,

t-Bu group inhibits the resonance hence C一N bond is only single bond.

2) Dipole moments: 

        Steric inhibition reduces the dipole moments because their dipole distance becomes less in aromatic compounds  

 
 Distance of two poles is large.

 Distance of two poles is less.