106583-99-7Relevant academic research and scientific papers
Synthesis of RuHCl(CO)(Hdmpz)(L)2 (L=PPh3, AsPh3, and Hdmpz=3,5-dimethylpyrazole) and crystal structure of RuHCl(CO)(Hdmpz)(AsPh3)2
Huh, Seong,Kim, Youngmee,Youm, Kyoung-Tae,Jun, Moo-Jin
, p. 2625 - 2631 (1999)
Treatment of RuHCl(CO)(L)3 with a slight excess amount of K[HB(3,5-Me2pz)3] in boiling MeOH solution yielded unusual 3,5-dimethylpyrzaole (Hdmpz) complexes, RuHCl(CO)(Hdmpz)(L)2 (L=PPh3, 1 or AsPh3, 2). Unexpectedly the dissociation of the bonds between the boron atom and the nitrogen atoms of the potentially tridentate [HB(3,5-Me2pz)3]- ligand during the coordination of the ligand to the RuII metal has been observed. In a separate preparation, the RuHCl(CO)(Hdmpz)(PPh3)2 complex has also been synthesized from the reaction between RuHCl(CO)(PPh3)3 and the monodentate Hdmpz ligand. Complexes 1 and 2 have been characterized by elemental analysis, IR and 1H NMR spectroscopies. Compound 1 has also been prepared by the reaction between RuHCl(CO)(PPh3)3 and K[H2B(3,5-Me2pz)2] in boiling toluene solution. The crystal structure of 2 has been studied by X-ray crystallography. The geometrical structure around RuII of 2 is a distorted octahedral structure. The crystal structure of 2 consists of a discrete monomeric compound. It is interesting to find that the sterically-demanding [HB(3,5-Me2pz)3]- or [H2B(3,5-Me2pz)2]- ligands break up during the reaction with the RuII complexes to form the neutral 3,5-dimethylpyrazole complexes. In contrast to these observations, [H2Bpz2]- and [H2B(4-Brpz)2]- ligands form very stable RuII complexes. Elsevier Science Ltd.
Pyrazole cleavage of tris(3,5-dimethylpyrazolyl)borate with Ruthenium(II) complexes: Synthesis, structural characterization and DFT studies
Kharbani, Donkupar,Deb, Debojit Kumar,Mawnai, Ibaniewkor L.,Kurbah, Sunshine D.,Sarkar, Biplab,Rymmai
, p. 264 - 270 (2016/12/30)
The reaction of [Ru(H)(Cl)(CO)(PPh3)3] (1) with KTp* (KTp* = Potassium tris(3,5-dimethylpyrazolyl)borate) in a refluxing toluene yields a mixture of [RuTp*(H)(CO)(PPh3)] (2), [Ru(H)(Cl)(pz*H)(CO)(PPh3)2] (3), and [H(pz*)B(μ-pz*)2B(pz*)H] (4) (pz*H = 3,5-dimethylpyrazole). The products (3) and (4) were obtained by the degradation of the scorpionate ligand, Tp*. These complexes were characterised by IR, 1H NMR, UV, X-ray crystallography and DFT calculations.
Phenylacetylene dimerization promoted by ruthenium(II) complexes
Echavarren, Antonio M.,Lopez, Javier,Santos, Amelia,Montoya, Julio
, p. 393 - 400 (2007/10/02)
The complex Ru(CO)(CH=CHPh)Cl(C5H5N)(PPh3)2 and related alkenyl complexes react in methanol or ethanol to give (E,E)-1,4-diphenylbuta-1,3-diene and the ruthenium(II) hydride Ru(CO)H(Cl)(C5H5N)(PPh3)3.Futher reaction of this hydride with the butadiene results in 1,2-reduction to yield (E)-1,4-diphenyl-1-butene.However, the reaction of phenylacetylene with catalytic amounts of ruthenium hydrides gave the dimer (Z)-1,4-diphenylbuten-3-yne.On the other hand, the reaction of 1,2-diphenylethenylruthenium(II) derivatives in methanol or ethanol gave trans-stilbene rather than the butadiene.Several deuteration experiments were performed in order to elucidate the mechanism of formation of (E,E)-1,4-diphenylbuta-1,3-diene and ruthenium hydride from the corresponding alkenyl complexes.
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)
Romero, Antonio,Vegas, Angel,Santos, Amelia,Cuadro, Ana M.
, p. 183 - 186 (2007/10/02)
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.
