The reaction of dipyrazol-1-yl ketone with appropriate ketonic compounds is catalyzed by the presence of CoCl2, to yield dipyrazolylalkanes (C3H3N2)2CRR′, (a) where R = R′ = CH3, CD3, C2H5; (b) where R = H, R′ = CH3, C6H5; (c) where R = CH3, R′ = C2H5; and 1,1-dipyrazolylcycloalkanes derived from cyclobutanone, pentanone, hexanone, 3-methyl and 4-methylhexanone. Cobalt(II) chloride reacts with dipyrazol-1-yl ketone, in tetrahydrofuran, to yield the complex CoCl2(C3H3N2)2CO, and in acetone or acetone-d6 to yield CoCl2(C3H3N2)2C(CH3)2 or CoCl2(C3H3N2)2C(CD3)2.