Borodkin, G. I. published the artcileReaction of Nitrosonium Tetrafluoroborate with Nitroxyl Radicals, Name: 4-Acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium Tetrafluoroborate, the publication is Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii) (2003), 39(8), 1144-1150, database is CAplus.
It was established by means of multinuclear magnetic resonance method (1H, 13C, 19F and 14N) that reaction of 2,2,6,6-tetramethyl-4-R-piperidin-1-oxyl radicals (R = H, OH, OMe, OCOPh, NHCOMe) with nitrosonium tetrafluoroborate gave rise to the corresponding 2,2,6,6-tetramethyl-1-oxo-4-R-piperidinium tetrafluoroborates. Linear correlations were found between the chem. shifts of atoms H4, C4 of cations and resp. σ1-constants of substituents R and chem. shifts of C4 atom calculated from increments of substitution. The conformational features of the generated nitrosonium cations are considered on the grounds of vicinal coupling constants JHH and quantum-chem. calculations by AM1 method.
Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii) 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, Name: 4-Acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium Tetrafluoroborate.
Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem