Synthesis, characterization, cis-ligand substitution and catalytic alkane hydroxylation by mononuclear nickel(II) complexes stabilized with tetradentate tripodal ligands

Catalytic Hydroxylation of Polyethylenes

“…The combination of nickel catalysts and m CPBA ( meta -chloroperoxybenzoic acid) has been shown to oxidize cyclohexane to form alcohols over ketones with high turnover numbers. − Although such reactions are far from oxidations of polyolefins, we explored the potential of this type of system to catalyze the hydroxylation of polyethylenes. Translation of this reactivity to polyolefins would require improvements to the catalyst, analysis of selectivity, and careful studies on potential side reactions that could lead to chain cleavage and cross-linking.…”

“…We report an approach to the hydroxylation of polyethylene without competing chain scission or cross-linking based on nickel-catalyzed oxidations of C–H bonds. − Our initial studies on linear alkanes revealed the most active nickel catalysts and evidence that the processes occur without typical side reactions resulting from free alkyl radicals. Application of this system to the functionalization of a range of polyethylenes with varying molecular weights and alpha-olefin comonomers showed that the oxidation occurred selectively at secondary C–H bonds of these polymers and, in contrast to previous uncatalyzed hydroxylation of polyethylene, occurred without competing chain scission or cross-linking.…”

Synthesis, Crystal Structures and Catalytic Activities of Two Copper Coordination Compounds Bearing an N,N’-Dibenzylethylenediamine Ligand

“…To develop novel and efficient catalysts, copper ions coordinated to a suitable ligand with multiple coordination sites and strong coordination abilities have been assembled into different copper coordination compounds [10,11]. Diamine and its derivatives are an important class of organic compounds with highly flexible N,N-donor atoms that can coordinate to different metal ions, thus producing a variety of mononuclear [12][13][14], binuclear [15][16][17], and polynuclear metal coordination compounds with excellent catalytic activities [18][19][20].…”

Synthesis, Crystal Structure and Catalytic Properties of 3D Supramolecular Complex [Zn(AMPy)2(OAc)]2[Zn(OAc)4]·2H2O with Water Clusters (AMPy = 2‐(aminomethyl)pyridine)

“…Through the weak interaction of hydrogen bonds, π–π stacking, and so on, these complexes could be connected into special 1D, 2D, and 3D supramolecular complexes . Over the past few decades, these metal complexes have been attracting widespread concerns on their potential applications in various fields such as magnetism, catalysis, luminescence, and bioactivity . Particularly, transition metal complexes have excellent catalytic properties, especially in catalyzing CC and CN bond forming reactions .…”