Reaction of 2-(1-aryl-5-phenylpyrazol-4-yl)-1H-benzimidazoles with the dimethylacetal of DMF
Previously [1] we assigned the structure 2a,b to the products of the reaction of 2-(1-aryl5-phenylpyrazol-4-yl)-1H-benzimidzoles 1a,b with the dimethylacetal of DMF. This conclusion did not contradict the H NMR spectral data, the elemental analysis, and information [2] on the existence of polycondensation of heterocyclic systems of this type. The result appeared to be unusual on the background of known [3-5] properties of the dimethylacetal of DMF.