The title compd. (I) is prepd. by reaction of an aq. soln. contg. 2 equiv. alkali nitrite, 2 NH4 salt of an org. or inorg. acid, and 2 NH3 with 5
equiv. CH2O at 5-10. Thus, 202 g. CH2O was added dropwise to an aq. soln. contg. 54 g. NH4Cl, 69 g. NaNO2, 86 g. 25% NH4OH, and 200 g. H2O
with stirring at 5-10 for 3 hrs., then 30 g. AcOH added to the mixt. and the mixt. stirred 5 hrs., and kept overnight. After filtration,
washing of the ppt. and drying gave 94% I, m. 208-10 (decompn.).
|