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1H and 13C NMR Data for Palitantine and its Derivatives

✍ Scribed by Š. Mierisová; B. Proksa; T. Liptaj

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
216 KB
Volume
34
Category
Article
ISSN
0749-1581

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✦ Synopsis

H and 13C N M R data for palitantine and three derivatives, iodopalitantine, palitantol and diacetate palitantine, are reported. Spectral assignment was carried out on the basis of two-dimensional ' H,' H and heteronuclear ' H,' 3C correlation experiments.

KEYWORDS ' H NMR; 13C NMR; palitantine derivatives

HETCOR experiments with delays optimized for ' J and ' J values of 9 Hz.

RESULTS AND DISCUSSION

Data for compounds 1-16 (Table 1) are given in Tables 2 and3 andthose for compounds 17-33 (Table 4) are given in Tables 5 and6.

Tables 2 and5 give the chemical shifts for the protons of the imidazo[l,2-a]pyrazine moiety and those of substituents. As expected, the aromatic protons are influenced by their positions in the rings and by the screening effects of the substituents. Similarly, the chemical shifts for carbon atoms, reported in Tables 3 and6, are in agreement with expectation and reflect the substitution pattern of the aromatic system. The assignments were based on HETCOR and COLOC spectra for some model compounds (5,s and 17). This allowed us to assign confidently the chemical shifts for carbons of the other derivatives by comparison.

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