The second is brute force by OH-:
Both methods require vigorous conditions - high acid/base concentration, high heat, and long reaction times. Secondary and tertiary amides hydrolyse even more slowly.
A secret weapon to force the hydrolysis of a tertiary amide is to use a very strong base such as Potassium tert-butoxide. This deprotonates the tetrahedral intermediate:
It may be difficult to make an amine anion leave, but something has to, and O2- or a carbanion are much harder to push off.
successful
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