37988-38-8Relevant articles and documents
Synthesis, structure and oxo-transfer properties of dioxotungsten(VI) complexes with pyridine-based NO- and NS-bidentate ligands
Wong,Yang,Zhou,Lee,Mak,Ng
, p. 353 - 357 (2001)
Treatment of [WO2Cl2(DME)] with 2-pyridylalkoxo NO-bidentate ligands [HLn (n = 1-5)] in the presence of n-BuLi or 2-pyridylthiolato NS-bidentate ligands [LiLn (n = 6, 7)] gave the corresponding dioxotungsten(VI)
Mechanism of Oxidative Dehydrogenation of Alcohols co-ordinated to Ruthenium
Ridd, Michael J.,Gakowski, David J.,Sneddon, Graeme E.,Keene, F. Richard
, p. 1949 - 1956 (1992)
The oxidative dehydrogenation of the complexes 2+, 2+ and >2+ to the corresponding carbonyl species has been studied in aqueous solution by kinetic and electrochemical techniques.The mechanistic scheme was found to involve the intermediacy of a ruthenium(IV)-alkoxide species, formed by disproportionation of the ruthenium(III) complex produced in the initial step of the oxidation process.The rate-determining removal of the proton from the α-carbon atom of the chelate ring is general-base catalysed.
Electrochemical properties and C-H bond oxidation activity of [Ru(tpy)(pyalk)Cl]+ and [Ru(tpy)(pyalk)(OH)]+
Nilles, Christian K.,Herath, Hashini N. K.,Fanous, Hanna,Ugrinov, Angel,Parent, Alexander R.
, p. 9701 - 9708 (2018/08/06)
[Ru(tpy)(pyalk)Cl]Cl (pyalk = 2-(2′-pyridyl)-2-propanol) was synthesized and characterized crystallographically and electrochemically. Upon dissolution in water and acetonitrile, [Ru(tpy)(pyalk)Cl]Cl was found to form [Ru(tpy)(pyalk)Cl]+ and [Ru(tpy)(pyalk)(OH)]+, respectively. The Ru(ii/iii) couple of [Ru(tpy)(pyalk)Cl]+ was found to be relatively low compared to that of other Ru complexes in acetonitrile, but the Ru(iii/iv) couple was not significantly different than other Ru complexes bearing anionic ligands. Pourbaix diagrams were generated for [Ru(tpy)(phpy)(OH2)]+ (phpy = 2-phenylpyridine) and [Ru(tpy)(pyalk)(OH)]+ in water, and it was found that [Ru(tpy)(pyalk)(OH)]+ has a lower Ru(ii/iii) potential than [Ru(tpy)(phpy)(OH2)]+ under neutral to alkaline pH. [Ru(tpy)(pyalk)(OH)]+ was found to catalyze C-H bond hydroxylation of secondary alkanes and epoxidation of alkenes using cerium(iv) ammonium nitrate as the primary oxidant.
Ligand Tuning in Pyridine-Alkoxide Ligated Cp?IrIII Oxidation Catalysts
Sackville, Emma V.,Kociok-K?hn, Gabriele,Hintermair, Ulrich
supporting information, p. 3578 - 3588 (2017/10/03)
Six novel derivatives of pyridine-alkoxide ligated Cp?IrIII complexes, potent precursors for homogeneous water and C-H oxidation catalysts, have been synthesized, characterized, and analyzed spectroscopically and kinetically for ligand effects. Variation of alkoxide and pyridine substituents was found to affect their solution speciation, activation behavior, and oxidation kinetics. Application of these precursors to catalytic C-H oxidation of ethyl benzenesulfonate with aqueous sodium periodate showed that the ligand substitution pattern, solution pH, and solvent all have pronounced influences on initial rates and final conversion values. Correlation with O2 evolution profiles during C-H oxidation catalysis showed these competing reactions to occur sequentially, and demonstrates how it is possible to tune the activity and selectivity of the active species through the NO ligand structure.