Gerleve, Carolin published the artcileTransition-Metal-Free Oxidative Cross-Coupling of Tetraarylborates to Biaryls Using Organic Oxidants, Quality Control of 219543-09-6, the publication is Angewandte Chemie, International Edition (2020), 59(36), 15468-15473, database is CAplus and MEDLINE.
Readily prepared tetraarylborates undergo selective (cross)-coupling through oxidation with Bobbitt’s salt to give sym. and unsym. biaryls. The organic oxoammonium salt can be used either as a stoichiometric oxidant or as a catalyst in combination with in situ generated NO2 and mol. oxygen as the terminal oxidant. For selected cases, oxidative coupling is also possible with NO2/O2 without any addnl. nitroxide-based cocatalyst. Transition-metal-free catalytic oxidative ligand cross-coupling of tetraarylborates is unprecedented and the introduced method provides access to various biaryl and heterobiaryl systems.
Angewandte Chemie, International Edition published new progress about 219543-09-6. 219543-09-6 belongs to piperidines, auxiliary class Piperidine,Fluoride,Salt,Amine,Amide, name is 4-Acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium Tetrafluoroborate, and the molecular formula is C11H21BF4N2O2, Quality Control of 219543-09-6.
Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem