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2020

Synthesis, Structural Analysis and Application of Aryl‐Diadamantyl Phosphine ligands in Palladium Catalyzed Cross‐Coupling Reactions, Ádám Sinai, Dániel Csaba Simkó, Fruzsina Szabó, Attila Paczal, Tamás Gáti, Attila Bényei, Zoltán Novák, András Kotschy, Eur. J. Org. Chem. 2020, 9, 1122-1128. DOI: 10.1002/ejoc.201901834 | [Full Text Link] [Supp. Info. Link]

Synthesis, temperature dependent NMR structure investigation and utilization of a new, stable and easily accessible aryl‐diadamantylphosphine ligand family is reported. The bulky and electron rich phosphorous center of the ligand enhances the catalytic activity of palladium in cross‐coupling reactions of sterically demanded ortho substituted aryl halides. In our study we demonstrated the synthetic applicability of the new phosphine ligands in Buchwald‐Hartwig and tosyl hydrazone coupling reactions.

zng pub 76

Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion, Marcell Gajdics, Tony Spassov, Viktória Kovács Kis, Ferenc Béke, Zoltán Novák, Erhard Schafler, Ádám Révész, Energies 2020, 13, 563. DOI: 10.3390/en13030563 | [Full Text Link]

A high-energy ball milling and subsequent high-pressure torsion method was applied to synthesize nanocrystalline magnesium samples catalyzed by TiO2 or titanate nanotubes. The microstructure of the as-milled powders and the torqued bulk disks was characterized by X-ray diffraction. The recorded diffractograms have been evaluated by the convolutional multiple whole profile fitting algorithm, which provided microstructural parameters (average crystal size, crystallite size distribution, average dislocation density). The morphology of the nanotube-containing disks has been examined by high-resolution transmission electron microscopy. The effect of the different additives and preparation conditions on the hydrogen absorption behavior was investigated in a Sieverts’-type apparatus. It was found that the ball-milling route has a prominent effect on the dispersion and morphology of the titanate nanotubes, and the absorption capability of the Mg-based composite is highly dependent on these features.

Keywords: ball milling; high-pressure torsion; magnesium; titanate nanotubes; hydrogen storage

zng pub 75

 

Development of Ni‐Ir dual photocatalytic Liebeskind coupling of sulfonium salts for the synthesis of 2‐benzylpyrrolidines, Bálint Varga, Zsombor Gonda, Balázs L. Tóth, András Kotschy, Zoltán Novák, Eur. J. Org. Chem. 2019. 10, 1466-1471. DOI: 10.1002/ejoc.201900957 | [Full Text Link] [Supp. Info. Link]

A new method has been developed for the synthesis of 2‐benzylpyrrolidines utilizing cross‐coupling and photoredox catalysis. Using a well‐established dual Ni‐Ir system, we were able to successfully couple benzylsulfonium salts with a proline utilizing radical forming through CO2 extrusion. This enabled the simple one step synthesis of 2‐benzylpyrrolidines from stable inexpensive starting materials.

zng pub 74