Trinuclear Dioxidomolybdenum(VI) Complexes of Tritopic Phloroglucinol‐Based Ligands and Their Catalytic Applications for the Selective Epoxidation of Olefins

Abstract

Four trinuclear dioxidomolybdenum(VI) complexes, [{Mo VI O 2 (H 2 O)} 3 ptk(bhz) 3 ] (1), [{Mo VI O 2 (H 2 O)} 3 ptk(fah) 3 ] (2), [{Mo VI O 2 (H 2 O)} 3 ptk(inh) 3 ] (3), and [{Mo VI O 2 (H 2 O)} 3 ptk(nah) 3 ] (4), based on the tritopic central 2,4,6-triacetylphloroglucinol (H 3 ptk) ligands H 6 ptk(bhz) 3 (I), H 6 ptk(fah) 3 (II), H 6 ptk(inh) 3 (III) and H 6 ptk(nah) 3 (IV) (Hbhz = benzoylhydrazide, Hfah = 2furanoylhydrazide, Hinh = isonicotinoylhydrazide and Hnah = nicotinoylhydrazide), respectively, are presented. All of the synthesized ligands, as well as their complexes, have been characterized by elemental, thermal, and electrochemical analyses, spectroscopic techniques (FTIR, UV/Vis, 1 H and 13 C NMR), and single-crystal X-ray studies of [{Mo VI O 2 (H 2 O)}{Mo VI O 2 (MeOH)} 2ptk(bhz) 3 ]·2H 2 O·1.25MeOH (1a) and [{Mo VI O 2 (EtOH)} 3 ptk-[a] 2952[a] Total mass loss considering the temperature range given in the previous column.

4,6‐Diacetyl Resorcinol Based Vanadium(V) Complexes: Reactivity and Catalytic Applications

“…Overall our results also compare well with the ones obtained with a few Mo‐catalysts which have shown the following values: [MoO 2 Cl 2 ( N , N ‐dimethylbenzamide) 2 ] (99/100 % conversion at 6 h/24 h of reaction time), [MoO 2 {1,4‐bis(2‐hydroxybenzyl)‐( S , S )‐2,2′‐bipyrrolidine}](95 %, 1 h), [MoO 2 Cl 2 (pbim)] (82/98 %, 6 h/24 h), [Mo 2 O 6 {( S )‐4‐(1‐phenylpropyl)‐1,2,4‐triazole} 2 ] (98/100 %, 6 h/24 h), [Mo 2 O 6 (4,4′‐di‐ tert ‐butyl‐2,2′‐bipyridine) 2 ] (93/100 %, 6 h/24 h), (Htrz) 2 [Mo 3 O 6 (O 2 ) 4 (trz) 2 ] · H 2 O (trz = 1,2,4‐triazole)(92/99 %, 6 h/24 h), [{Mo VI O 2 (H 2 O)} 3 ptk(inh) 3 ] (99/100 % 2 h/24 h), and [Mo 2 O 6 (HpypzA)] n (57/82 %, 6/24 h) …”

Two ionic oxo‐vanadate and dioxo‐molybdate complexes of dinitro‐aroylhydrazone derivative: Effective catalysts for epoxidation reactions, biological activity, ctDNA binding, density functional theory, andin silicoinvestigations

“…S2a). 13 C NMR δ = 117.68 (CH), 119.99 (CH), 123.32 (C q ), 129.97 (CH), 136.88 (CH), 143.56 (CH), 146.96 (CH), 151.02 (C q ), 153.17 (C q ), 161.24 (C q ), 166.38 (C q ), 179.10, and 192.52 ppm (CH=N) (Figure S2b).…”

“…The 1 H NMR and 13 C NMR spectra of the bidentate sodium sulfonate aroylhydrazone ligand (HLZNa) are presented (Figure S1a,b). The high significant 1 H NMR spectral signals were positioned at δ = 9.37 and 10.53 ppm for the -CH=N-(Schiff base) proton and the amino proton (-NH), respectively.…”

“…The (-CH=N-) proton displayed a strong downfield shift, which could indicate the reduction in electron density over the nitrogen atom due to its coordination with MoO 2 2+ ion (Scheme 2). [18,20] The 13 C NMR spectral scan assigned the most distinguished signals, which were located at 173.22 ppm referring to the azomethine (-CH=N-) carbon nuclei for the free ligand, HLZNa (Figure S1b). The characteristic signal was also notably shifted after complexation with MoO 2 2+ ion to 192.52 ppm.…”

Manganese Ferrite Nanoparticles Modified by Mo(VI) Complex: Highly Efficient Catalyst for Sulfides and Olefins Oxidation Under Solvent‐less Condition

“…Transition metal complexes are widely used as catalysts for production of important organic compounds Mo(VI) complexes have in particular found interest for the oxidation of olefins‐ and sulfides‐ into epoxides‐ and sulfoxides‐ to provid access to industrially important compounds, surfactants, intermediates, drug, antifungal agents and epoxy resins . Homogeneous catalysts are mainly used for these chemical transformations.…”