1H and 13C NMR
spectra were recorded on a 500 MHz NMR spectrometer (1H
at 500 MHz and 13C at 126 MHz) in a DMF-d7/DCM-d2 mixture (vol. 1:1)
and CD3OH. These solvents were selected because they allow
measurements at very low temperatures. Spectra were referenced to
the solvent signal δ = 2.75 and δ = 3.31, respectively.
Characterization spectra of the newly prepared compounds were recorded
on a 500 MHz NMR spectrometer (1H at 500 MHz and 13C at 126 MHz) in DMSO-d6 [δ = 2.50
(1H) and δ = 39.70 (13C)]. Complete signal
assignment was based on the homo- and hetero-nuclear correlation experiments
COSY, HSQC, and HMBC. Solvents used in the experiments were purchased
from Eurisotop (DMF-d7, DCM-d2, and CD3OH in 750 μL ampoules).
spectra were recorded on a 500 MHz NMR spectrometer (1H
at 500 MHz and 13C at 126 MHz) in a DMF-d7/DCM-d2 mixture (vol. 1:1)
and CD3OH. These solvents were selected because they allow
measurements at very low temperatures. Spectra were referenced to
the solvent signal δ = 2.75 and δ = 3.31, respectively.
Characterization spectra of the newly prepared compounds were recorded
on a 500 MHz NMR spectrometer (1H at 500 MHz and 13C at 126 MHz) in DMSO-d6 [δ = 2.50
(1H) and δ = 39.70 (13C)]. Complete signal
assignment was based on the homo- and hetero-nuclear correlation experiments
COSY, HSQC, and HMBC. Solvents used in the experiments were purchased
from Eurisotop (DMF-d7, DCM-d2, and CD3OH in 750 μL ampoules).