With bromine in acetic acid solution at ordinary temperature, nicotine yields a perbromide, C10H10Br2N20 HBr 3, which with sulphur dioxide, followed by potash, gives dibromcotinine, C10H10Br2N20, from which cotinine, C10H12N20, is obtained by distillation over zinc dust.
By the addition of potassium bromide and bromine water to diazonium salts they are converted into a perbromide, e.g.
It is the hydrogen compound corresponding to P. Greiss' diazoimino benzene, C 6 H 5 N 3, which is prepared by the addition of ammonia to diazobenzene perbromide.
Grandmougin (Berichte, 1891, 24, p. 2546) obtained azoimide from dinitraniline, C 6 H 3 (NO 2) 2 NH 2j by diazotization and conversion of the diazo compound into the perbromide, (NO 2) 2 C 6 H 3 N 2 Br 3.