Triazaphosphaadamantane-functionalized terpyridine metal complexes: cyclohexane oxidation in homogeneous and carbon-supported catalysis

Abstract

A metal complex bearing 1,3,5-triaza-7-phosphaadamantane and terpyridine scaffolds as a single polydentate ligand was used as a recyclable catalyst for synthesizing the nylon precursor, KA oil.

Cagelike Manganesesilsesquioxane Complexes: Synthesis via an Acetone Approach, Structure, and Catalytic Activity for Toluene Oxidation

“…TBHP was selected as an environmentally friendly oxidizing agent, comparable to hydrogen peroxide (H 2 O 2 ) and molecular oxygen (O 2 ), due to its higher reactivity in comparison to O 2 and greater thermal stability than H 2 O 2 . Furthermore, TBHP could be conveniently employed as an oxidizing agent in a closed vial under microwave irradiation. ,, Acetonitrile was chosen as the preferred solvent for its resistance to oxidation under the experimental conditions employed in this study and its ability to activate peroxides by forming the peroxyimidic acid intermediate, which acts as an effective oxygen transfer agent …”

“…101 Furthermore, TBHP could be conveniently employed as an oxidizing agent in a closed vial under microwave irradiation. 84,102,103 Acetonitrile was chosen as the preferred solvent for its resistance to oxidation under the experimental conditions employed in this study and its ability to activate peroxides by forming the peroxyimidic acid intermediate, which acts as an effective oxygen transfer agent. 104 To investigate the effect of the catalyst loading, the reactions were typically conducted in the presence of 0.4 mmol of toluene, 1.2 mmol (3 equiv) of the TBHP oxidant, and nitric acid (acid/catalyst ratio of 50) in acetonitrile at 80 °C under microwave irradiation for 1 h. Increasing the catalyst amount from 0.25 to 3 mol % had a negative impact on the total yield, which decreased from 19 to 11%, and the amount of benzaldehyde obtained (Table 1, entries 1−3, and Figure 5).…”

“…Significant progress has been made in the field of homogeneous catalytic oxidation of toluene using various abundant first-row transition metal catalysts that show promising catalytic activities. − Manganese-based catalysts have gained considerable attention due to the high natural abundance and varied oxidation states (−3 to +7) of this metal. ,− Although hydrocarbon catalytic oxidation reactions based on Mn complexes have been intensively studied, − their utilization for homogeneous oxidation of toluene is still very scarce …”

Novel cyano-activated Cu(ii) complexes of arylhydrazones of active methylene nitriles and their catalytic application for azide–alkyne cycloaddition in water and glycerol

“…[11][12][13] In some cases, catalytic conversions are often better in an aqueous medium than in pure organic solvents due to the unique features of water such as high dielectric constant, the ability to act as a nucleophile or a leaving group, and the ability to solubilize polar reactants and catalysts. [14][15][16][17][18] Although homogeneous CuAAC can proceed in aqueous medium, the presence of an organic co-solvent (e.g. acetonitrile) is vital to dissolve the organic reactants and increase the efficiency of the catalytic reaction.…”

Bimetallic Nanoparticles Embedded in P,N,Br‐Codoped Carbon Matrices Derived from Heterometallic‐Organophosphine Frameworks as Electrode Materials for Asymmetric Supercapacitors

“…[29] Recently, we developed a novel strategy to address this challenge by obtaining PTA derivatives via N-alkylation, which contain hard donor coordination sites (e. g. carboxylate group). [30,31] This approach enables the coordination of PTA derivatives through the hard donor coordination sites to the first-row transition metal ions Mn(II), Co(II) and Ni(II), [30] as well as post transition metals such as Sn(IV). [31] Using this strategy, the soft P atom remains free and ready for further coordination to a soft metal centre, providing the possibility of obtaining heterometallic coordination compounds that contain both soft and hard transition metal atoms.…”