Which extraction procedure will completely separate an amide from the byproduct of the reaction between an amine and excess carboxylic acid anhydride?
a. add 0.1 m naoh to quench unreacted anhydride. then add diethyl ether and separate the layers. the amide can be obtained from the ether layer by evaporating the solvent.
b. add 0.1m hal to quench unreacted anhydride. then add diethyl ether and separate the layers. the amide can be obtained from the ether layer by evaporating the solvent.
c. add 0.1m naoh to quench unreacted anhydride. then add diethyl ether and separate the layers. the amide can be obtained from the aqueous layer by neutralizing with hcl.
d. add 0.1m hal to quench unreacted anhydride. then add diethyl ether and separate the layers. the amide can be obtained from the aqueous layer by neutralizing with naoh.