6230 accurate mass tof lc ms system

All chromatographic separations were accomplished with Silica Gel 60N (Kanto Chemical Co., Inc.). Thin-layer chromatography (TLC) was performed with Macherey-Nagel Sil G25 UV₂₅₄ pre-coated TLC plates. Reagents were used without further purification unless otherwise specified. Melting points were recorded on a Yanagimoto micro melting point hot-stage apparatus (MP-S3) and are not corrected. IR spectra were recorded on a SHIMADZU FTIR-8400S spectrophotometer and are reported in frequency of absorption (cm⁻¹). Only selected IR peaks are reported. ¹H NMR (TMS: δ = 0.00 ppm as an internal standard), ¹³C NMR (CDCl₃: δ = 77.00 ppm as an internal standard), ¹⁹F NMR (trifluoromethylbenzene: δ = −64.0 ppm as an external standard) and ⁷⁷Se NMR (Ph₂Se₂: δ = 436.15 ppm as an internal standard) spectra were recorded on a JEOL ECZ-400S (400 MHz, 100 MHz, 376 MHz and 76 MHz) spectrometer in CDCl₃ unless otherwise stated. GC-MS (EI) spectra were recorded on Agilent 5977E Diff-SST MSD-230V spectrometer. HRMS (ESI) were recorded on Agilent 6230 Accurate-Mass TOF LC/MS system. The X-ray diffraction measurements carried out using a Rigaku XtaLAB Synergy, single source at home/near, HyPix3000 diffractometer. Spectroscopic data of 5-arylselanyluracils 5a, p, q, and 5s are in accordance with the literature.^{8,11,13 (link)}