Diazotization of aminofurazans (1) and 4-aminofuroxans (2) with nitros
ylsulfuric acid in a mixture of conc. H2SO4 and H3PO4 has been studied
and offered as a general method for preparing furazanyl- (3) and furo
xanyldiazonium (4) salts. It has been shown that reactions with the re
tention of the N-N-group (azo coupling, formation of triazenes and azi
des) are typical of salts 3 and 4, while elimination of the N2 molecul
e (Sandmeyer reaction, hydrolysis, reduction) is not typical.