Amidrazones 10. Stevens rearrangement of 1-benzyl and 1-allyl-substituted-3-amino-4,5-dihydro-1-phenyl-1H-pyrazolium bromides

Abstract 2-Benzyl-3-imino-1-phenylpyrazolidine ( 5a ) and 2-allyl-3-imino-1-phenylpyrazolidine ( 5b ) are obtained by the base-promoted rearrangement of the title compounds ( 4a and 4b ).