These are results of Darek’s and Magda’s collaborations:
Metal-free oxoammonium salt-mediated C(sp3)–H oxidative Ugi-azide multicomponent reaction
Niklas Lohmann, Vesna Milovanović, Dariusz G. Piekarski and Olga García Mancheño
In this work, an efficient oxidative C(sp3)–H Ugi-azide multicomponent reaction of cyclic benzylic amines to the corresponding α-tetrazolo compounds using a TEMPO salt as mild hydride abstractor-type oxidant is reported. This simple one-pot approach allows the direct functionalization of N-heterocycles such as tetrahydroisoquinolines with a variety of isocyanides and NaN3 as a practical azide source. The reaction proceeds at room temperature and without the need of acid additives, allowing for the use of sensitive substrates, while minimizing isocyanide polymerization to provide the desired heterocycle-tetrazole products in synthetically useful yields (up to 99%).
Oxidized Multiwalled Carbon Nanotubes as Components and Oxidant Agents in the Formation of Multiwalled Carbon Nanotube/Polyazulene Composites
Emilia Grądzka, Joanna Breczko, Magdalena Bonarowska, Monika Wysocka-Żołopa, Anna Basa and Krzysztof Winkler
This work describes the practical and facile synthesis of oxidized multiwalled carbon nanotube/polyazulene (ox-MWCNT/PAZ) composites. In the proposed procedure, oxidized multiwalled carbon nanotubes were used both as components and oxidant agents in the formed composite material, which eliminated the use of conventional oxidizing agents such as ferric chloride. The properties and morphology of composite materials depend on the synthesis conditions, such as monomer concentration, synthesis time and synthesis temperature. The composite material is much more stable at high temperatures than pristine polyazulene. Additionally, the electrochemical performance of composite materials is better than that of pure polymeric materials. The highest specific capacitance of the ox-MWCNT/PAZ composite equals 381 F gPAZ−1. This value is approximately 5 times higher than the specific capacitance of pristine polyazulene. This high value results from the larger surface area of the composite material and its easier penetration by counterions of the supporting electrolyte during the oxidation process. Apart from the traditional doping process by counterions, the composite material is additionally codoped by hexafluorophosphate anions of the supporting electrolyte, which form hydrogen bonds with surface hydroxyl groups of ox-MWCNTs.