The coupling reactions of diazonium chlorides with sym-
1,3,5-triketones are described. The azo-form of the products · is
rearranged .into .the hydrazo-form during this reaction. Dihydrazones
(I) were formed in the sodiumacetate buffered so1ution
while in the sodium hydroxide solution both (I) and monohydrazones
(II) were formed. The spectroscopic analysis, based on the
data from infrared and ultraviolet spectra, indicates that dihydrazones
exist in the double syn-form with an intramolecular hydrogen
bond
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