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Unity inova 400 mhz

Manufactured by Agilent Technologies

The Unity Inova 400 MHz is a nuclear magnetic resonance (NMR) spectrometer designed for laboratory use. It operates at a frequency of 400 MHz and is capable of performing various NMR experiments for the analysis of chemical samples.

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5 protocols using unity inova 400 mhz

1

Characterization of Organic Compounds

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Melting points were measured on an electro thermal digital melting point (Büchi, Germany) without calibration. 1H-NMR spectra were recorded on Varian NMR AS and Varian Unity Inova 400 MHz NMR spectrometers. Chemical shifts were reported in parts per million (δ) units relative to the solvent peak. The 1H NMR data were reported as peak multiplicities: s for singlet; d for doublet; t for triplet; q for quartet; and m for multiplet. Coupling constants were recorded in hertz (Hz). MS spectra were measured using Jeol JMS 700 high resolution mass spectrometer from the Korea Basic Science Institute (Daegu). Reagents were of commercial grade and were purchased from Sigma-Aldrich Co. (St. Louis, MI, USA), Merck (Darmstadt, Geramny), Duksan Pure Chemical Co (Ansan, Korea).
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2

Synthesis and Characterization of Pyridine-Hydantoin Derivatives

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Melting points were measured in open capillary tubes on a MelTemp melting point apparatus and are uncorrected. NMR spectra were recorded on either a Varian Mercury+ 300 Hz or a Varian UnityInova 400 MHz instrument. d6-DMSO was purchased from Cambridge Isotope Laboratories. 1H NMR were calibrated to 2.49 ppm for d5-DMSO present in the d6-DMSO solvent, and 13C NMR spectra were calibrated from the central peak at 39.7 ppm for d6-DMSO. Coupling constants are reported in Hz. Scanned NMR spectra of compounds 15, 1729 are contained in the Supplementary Material. Elemental analyses were obtained from Midwest Microlabs, Ltd. (Indianapolis, IN, USA), and high-resolution mass spectra were obtained from the COSMIC lab at Old Dominion University. Pyridinecarboxaldehydes were purchased from Acros, Ambeed, or Ark Pharm; hydantoin was purchased from Acros.
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3

Characterization of Organic Compounds

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Melting points were measured on an electro thermal digital melting point (Büchi, Germany) without calibration. 1H-NMR spectra were recorded on Varian NMR AS and Varian Unity Inova 400 MHz NMR spectrometers. Chemical shifts were reported in parts per million (δ) units relative to the solvent peak. The 1H NMR data were reported as peak multiplicities: s for singlet; d for doublet; t for triplet; q for quartet and m for multiplet. Coupling constants were recorded in Hertz (Hz). MS spectra were measured using a Jeol JMS 700 high resolution mass spectrometer from the Korea Basic Science Institute (Daegu). Reagents were of commercial grade and were purchased from Sigma-Aldrich Co., Merck, (St. Louis, MO, USA) and Duksan Pure Chemical Co., (Seoul, Korea).
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4

NMR Characterization of FPBA, SVE, and Derivatives

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The 1H and 11B NMR spectra were recorded at 25 °C with a Varian Unity Inova 400 MHz spectrometer in quartz cuvettes using THF-d8 and DMF-d7 as solvents for FPBA and SVE, respectively, and CD3OD as a solvent for Pyr-FPBA (16.7 g/L) and SVE-FPBA (10 g/L). The solvent peaks were taken as references in all measurements.
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5

Anhydrous Reaction Conditions and NMR Analysis

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All reactions involving moisture or air sensitive reagents were carried out under a nitrogen atmosphere in oven-dried glassware with anhydrous solvents. THF and ether were distilled from sodium/benzophenone. Purifications by chromatography were carried out using flash silica gel (32–63 μ). NMR spectra were recorded on either a Varian Mercury+ 300 MHz or a Varian UnityInova 400 MHz instrument. CDCl3, CD3OD and d6-DMSO were purchased from Cambridge Isotope Laboratories. 1H NMR spectra were calibrated to 7.27 ppm for residual CHCl3, 3.35 ppm for CD2HOD, or 2.49 ppm for d5-DMSO. 13C NMR spectra were calibrated from the central peak at 77.23 ppm for CDCl3, 49.3 ppm for CD3OD, or 39.7 ppm for d6-DMSO. Coupling constants are reported in Hz. Elemental analyses were obtained from Midwest Microlabs, Ltd., Indianapolis, IN, and high-resolution mass spectra were obtained from the COSMIC lab at Old Dominion University.
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