Chemical properties of Ester Assignment Help

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Chemical properties

         (i) Hydrolysis :

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         Hydrolysis of ester by alkalies (NaOH) is known as saponification and leads to the formation of soaps

  •          This reaction (saponification) is irreversible because a resonance stabilized carboxylate (acetate) ion is formed.
  •          The acid hydrolysis of esters is reversible.

         (ii) Reaction with ammonia (ammonolysis) :

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         (iii) Reduction

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  •                    Reduction in presence of Na/C2H5OH is known as Bouveault Blanc reduction.
  •                    The catalytic hydrogenation of ester is not easy and requires high temperature and pressure. The catalyst most commonly used is a mixture of oxides known as copper chromate (CuO.CuCr2O4).

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         (iv) Reaction with PCl5 or SOCl2            

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         (v)           Reaction with alcohols : On refluxing ester undergoes exchange of alcohols residues.

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  •                      This reaction is called trans esterification or alcoholysis.

         (vi) Reaction with Grignard reagents

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         (vii) Claisen condensation

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         (viii) Reaction with hydrazine  

         1786_chemical properties of ester8.png

         (ix) Halogenation

 

         1867_chemical properties of ester9.png

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