New benzothiazole based copper(II) hydrazone Schiff base complexes for selective and environmentally friendly oxidation of benzylic alcohols: The importance of the bimetallic species tuned by the choice of the counterion was written by Bocian, Aleksandra;Gorczynski, Adam;Marcinkowski, Damian;Witomska, Samanta;Kubicki, Maciej;Mech, Paulina;Bogunia, Malgorzata;Brzeski, Jakub;Makowski, Mariusz;Pawluc, Piotr;Patroniak, Violetta. And the article was included in Journal of Molecular Liquids in 2020.Quality Control of Phenyl(pyridin-2-yl)methanone This article mentions the following:
Green and sustainable chem. approaches necessitate an ongoing investigation toward new, environmentally benign and selective catalysts. The authors have thus prepared a new benzothiazole-scaffold hydrazone Schiff base ligand L and coordinated it with copper(II) ions leading to five different complexes, the form of which in the solid state is counterion-dependent. Nitrate, chloride and triflate anions lead to monometallic species, whereas utilization of sulfates and tetrafluoroborates is responsible for the formation of bimetallic assemblies. The catalytic efficiency of synthesized compounds was shown in Cu-TEMPO (2,2,6,6-tetramethyl-l-piperidinoxyl) aerobic oxidation of activated alcs. resulting in good to excellent conversions and 100% selectivity to form the corresponding aldehydes. Considering the exptl. results and d. functional theory calculations we propose two most plausible reaction mechanisms that further corroborate the enhanced activity of bimetallic species. It appears that the tridentate character of the ligand sacrifices some of the overall catalytic efficiency for the selectivity of the process. Aqueous reaction medium, low catalyst loading, air as oxidant and exclusive oxidative selectivity render these CuII complexes promising candidates for further improvement. In the experiment, the researchers used many compounds, for example, Phenyl(pyridin-2-yl)methanone (cas: 91-02-1Quality Control of Phenyl(pyridin-2-yl)methanone).
Phenyl(pyridin-2-yl)methanone (cas: 91-02-1) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of −48.7 × 10−6 cm3·mol−1.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·mol−1 in the liquid phase and 140.4 kJ·mol−1 in the gas phase. One of the examples of pyridines is the well-known alkaloid lithoprimidine, which is an A3 adenosine receptor antagonist and N,N-dimethylaminopyridine (DMAP) analog, commonly used in organic synthesis.Quality Control of Phenyl(pyridin-2-yl)methanone