Hassannia, Ali published the artcileA simple and efficient synthesis of 1,4- and 1,5-dioxepan-2-one, Application of 4-Acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium Tetrafluoroborate, the publication is Letters in Organic Chemistry (2009), 6(6), 478-480, database is CAplus.
A novel synthesis of 1,4- and 1,5-dioxepan-2-one lactones was achieved through the regioselective oxidation of 3-(2-hydroxyethoxy)propan-1-ol. Under basic conditions, when 3-(2-hydroxyethoxy)propan-1-ol was oxidized using oxoammonium salts, a quant. oxidative esterification was observed, resulting in a regioselective lactone ring closure. This oxidation was tailored to afford 1,4-dioxepan-2-one in very good yield.
Letters in Organic Chemistry 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, Application of 4-Acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium Tetrafluoroborate.
Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem