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NMRInfrared vibrational spectrum of 11伪H-dihydrozaluzanin E has been measured at room temperature and it was analyzed theoretically by means of ab initio calculations. The conformational space of the compound has been scanned using molecular dynamics and complemented with functional density calculations...
(C) Positive ion mass spectrum of 2, m/z: [M + H]+ = 350. Using a combination of 1H and 13C NMR spectroscopy, the chemical structure of 2 was determined to be a dihydropyrazolo[1,5-a]pyrazin-4(5H)-one (Figure 1) arising from intramolecular cyclization of 1. 1H NMR analysis...
The NMR signal generated from the object to be examined is received by the coil 11 and detected and amplified by a transmitter-receiver 14 and the time distribution of the NMR signal is calculated by a digitizer 15 and subjected to Fourier transformation by a main calculator 16 to obtain ...