1332503-55-5Relevant academic research and scientific papers
Poly(pyrazolyl)aluminate complexes containing aluminum-hydrogen bonds
Snyder, Christopher J.,Heeg, Mary Jane,Winter, Charles H.
, p. 9210 - 9212 (2011)
The treatment of LiAlH4 with 2, 3, or 4 equiv of the 3,5-disubstituted pyrazoles Ph2pzH or iPr2pzH afforded [Li(THF)2][AlH2(Ph2pz)2] (97%), [Li(THF)][AlH(Ph2pz)3] (96%), [Li(THF)4] [Al(Ph2pz)4] (95%), and [Li(THF)][AlH(iPr 2pz)3] (89%). The treatment of ZnCl2 with [Li(THF)][AlH(Ph2pz)3] afforded Zn(AlH(Ph 2Pz)3)H (70%). X-ray crystal structures of these complexes demonstrated κ2 or κ3 coordination of the aluminum-based ligands to the Li or Zn ions. The treatment of [Li(THF)][AlH(Ph2pz)3] with MgBr2 or CoCl 2 in THF/Et2O solutions, by contrast, afforded the pyrazolate transfer products Mg2Br2(Ph2pz) 2(THF)3·2THF (25%) and Co2Cl 2(Ph2pz)2(THF)3·THF (23%) as colorless and blue crystalline solids, respectively. An analogous treatment of [Li(THF)][AlH(Ph2pz)3] with MCl2 (M = Mn, Fe, Ni, Cu) afforded metal powders and H2, illustrating hydride transfer from Al to M as a competing reaction path.
