BEHAVIOUR OF CHLORONITROBENZENES WITH HYDRAZINE AND  HYDRAZINE DERIVATIVES. PART I. PREPARATION OF 2-CHLORO-4: 6-DINITRO- AND 2-BROMO-4:6-DINITRO-PHENYLHYDRAZINES AND THEIR HYDRAZONES

A few polynitrophenylhydrazine derivatives have been prepared by the action of hydrazine on such compounds in which either a chlorine or a nitro group-is labile due to presence of at least two NO₂ either in o:o or in o:P positions. 2-Chloro- and 2-broma-4 :6-dinitrophenyIhydrazines have been reacted with a number of carbonyl compounds to yield phertylhydrazones.