Tris(pyrazolyl)methane molybdenum tricarbonyl complexes as catalyst precursors for olefin epoxidation

摘要: Abstract The molybdenum tricarbonyl complexes [Mo(CO)3(HC(3,5-Me2pz)3)] (1) and [Mo(CO)3(HC(pz)3)] (2) (HC(3,5-Me2pz)3 = tris(3,5-dimethyl-1-pyrazolyl)methane, HC(pz)3 = tris(1-pyrazolyl)methane) were obtained in good yields by the microwave-assisted reaction of Mo(CO)6 with respective organic ligand. Complete oxidative decarbonylation 1 2 was achieved excess tert-butylhydroperoxide (TBHP) 1,2-dichloroethane at 55 °C. For complex 1, (μ2-oxo)bis[dioxomolybdenum(VI)] hexamolybdate composition [{MoO2(HC(3,5-Me2pz)3)}2(μ2-O)][Mo6O19] (3) yield, its structure determined single crystal X-ray diffraction. compound (4) not unambiguously identified, but may be chemically analogous to 3. Compounds 1–4 examined for first time as homogeneous (pre)catalysts epoxidation olefins TBHP, using different types cosolvents During catalytic reactions transform situ into 3 4, respectively, latter two are fairly stable catalysts. Catalytic tests characterization studies recovered catalysts carried out an attempt understand kinetic differences observed between compounds prepared during those prior reaction, from same precursor complex.