Reactivity of Ruthenium(II) Complexes with 1-Hydroxymethyl- or 1-Benzyl-3,5-dimethylpyrazole and Similar Functionalized Bipyrazoles. X-Ray Crystal Structure of Carbonylchlorohydrido(3,5-dimethylpyrazole-N2)-bis(triphenylphosphine)ruthenium(II)

Article abstract of DOI:10.1039/DT9870000183

The complexes , , and react with 1-hydroxymethyl-3,5-dimethylpyrazole to give in all cases carbonylchlorohydrido(3,5-dimethylpyrazole-N²)bis(triphenylphosphine)ruthenium(II) (1a) as product.The substitution of the 1-hydroxymethyl group by hydrogen in the pyrazole ring is characteristic of these reactions.Similar reactions take place with 1,1'-di(hydroxymethyl)-3,3',5,5'-tetramethyl-4,4'-bipyrazole and -methylenedipyrazole to give binuclear bipyrazole-bridged complexes <2(μ-L')> .No reaction occurs with 1-benzyl-3,5-dimethylpyrazole nor with the corresponding 1,1'-dibenzylbipyrazole.We have determined the crystal structure of (Hdmpz = 3,5-dimethylpyrazole).It crystallizes in the space group P2₁n with a = 9.687(3), b = 16.244(6), c = 24.022(6) Angstroem, β = 94.19(2) deg, and Z = 4.Standard anisotropic least-squares refinement gave R = 0.060 for 3 920 observed reflections.The ruthenium atom is six-co-ordinated in a distorted octahedral geometry with the atom pairs (P,P), (Cl,H), and (C,N) in trans positions.

Full text of DOI:10.1039/DT9870000183

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