The methyl iodide induced conversion of N-methylphenylhydrazones to indoles has been studied and an enehydrazine intermediate 3c has been isolated."-Protonation of the enehydrazine leads to a facile electrocyclic ring closure. Ketazinium methiodides have been converted to pyrroles by heating. Action of acetic anhydride on cyclopentylketazine intercepted an intermediate in the pyrrole synthesis as the acetyl derivative of a tautomer ...
![[1,1'-Bicyclohexyl]-4-one,2-methyl-2-phenylhydrazone结构式](https://image.chemsrc.com/caspic/007/6623-14-9.png)