1, 2-DialkyI-and 1, 2-diarylperhydropyridazine-3, 6-diones (1) are reduced in high yield to the corresponding 1, 2-dialkyl-and 1, 2-diarylperhydropyridazines (2) on treatment with diborane at 65". Half-reduced 1, 2-di-alkylperhydropyridazin-3-ones (3a-3d) in addition to the fully reduced compounds 2a-2d are obtained if reactions are performed at 25". At higher diborane concentrations (IO equiv) at 65", compounds la-If undergo reduction of the ...
