Alcohols and Ethers

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General methods of preparation of Alcohols

(v)    By Grignard reagents : All the three types of monohydric alcohols (primary, secondary and tertiary alcohols) are obtained by the use of Grignard reagents and carbonyl compounds. The addition of RMgX on carbonyl compounds followed with hydrolysis yields alcohols.

   by-grignard-reagents

 

(vi)   By the reduction of carbonyl compounds : Reduction of aldehydes gives primary alcohol and

            reduction-of-carbonyl-compounds

            reduction of ketones gives secondary alcohol.

 

Note : tertiary alcohols can be obtained by this method.

 

(vii)   By the reduction of acids and their derivatives :

                 RCOOH     reduction-of-acids               RCH2OH

                                                             

                  (RCO2)O           as-above            RCH2OH

                   RCOCI             as-above                  RCH2OH

                   RCOOR'           as-above             RCH2OH + R'OH

Note : If C2H5OH + Na is used as reducing agent, the reduction is known as Bouveault-Blane reaction.

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