Which of the following will give cyclic elimination by heating?
- propanoic acid
- trimethyl isopropyl ammonium hydroxide
- cyclohexyl propanoate
Cyclic elimination by heating is Syn Pyrolytic elimination reaction. This is given by ester, quaternary ammonium salt, and amine oxide. The reaction is according to Hoffman. This cancels out option (1) and (2).
Option (4) is ester and hence the answer to the question.
But why does the ammonium salt not give the reaction? What am I getting wrong?