¹H and ¹³C NMR spectral assignments of novel flavonoids bearing benzothiazepine

1H and 13C NMR spectral assignments for 24 novel naphthalenylphenylpyrazolines

“…The carbon peak at 158.0 ppm showing long‐range coupling with the methoxy proton was assigned to C‐6′. The three protons with signals at 6.51, 6.54, and 7.16 ppm were correlated with each other in the COSY spectrum and were determined to be H‐5′, H‐3′, and H‐4′, respectively, based on comparison with previously reported chemical shifts . The remaining carbon peak at 158.1 ppm should be C‐2′.…”

“…To confirm the structures determined by NMR spectroscopy, we carried out high‐resolution mass spectrometry (HR/MS) on an ultraperformance liquid chromatography (UPLC)‐hybrid quadrupole‐time‐of‐flight mass spectrometer with a Waters Acquity UPLC system (Waters Corp., Milford, MA, USA) with the help of Prof. Choong Hwan Lee at Konkuk University, Korea . All HR/MS data were collected in M + mode, except for the data for derivatives 1 , 14 , and 16 , which were collected in [M + H] + mode.…”

1H and 13C NMR characterization of 1,3,4‐oxadiazole derivatives

“…To confirm the structures, HR/MS was carried out on an ultraperformance liquid chromatography–hybrid quadrupole time‐of‐flight mass spectrometer with a Waters Acquity ultraperformance liquid chromatography system (Waters Corp., Milford, MA) with the help of Prof. Choong Hwan Lee at Konkuk University, Korea . All HR/MS data were collected in [M + H] + mode (Table ).…”

Synthesis and structure elucidation of polyphenols containing the N′‐methyleneformohydrazide scaffold as aurora kinase inhibitors

“…To confirm the structures of the N ′‐methyleneformohydrazide‐containing polyphenols, ultra‐performance liquid chromatography‐hybrid quadrupole‐time‐of‐flight mass spectrometry was carried out by using a Waters ACQUITY UPLC system (Waters, Milford, MA) with the help of Prof. Choong Hwan Lee at Konkuk University, Korea . All high‐resolution mass spectrometry (HR/MS) data were collected as (M−H) − ions.…”