(Tetrazol-1-yl) acetic acid hydrazide (1) was condensed with p-chloro/
m-nitro benzaldehydes. The resulting hydrazones (2,3) were treated wit
h different diazotized amines to yield a series of new 1,3-diaryl-5-(t
etrazol-1-yl) acetyl formazans (2a-d, 3a-d).