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Carbon-13 chemical shift assignment of alkoxycarbonylalkylthiouracils and 3-oxothiazolo[3,2-a(or -c)]pyrimidin-5-ones

✍ Scribed by ElżBieta Wyrzykiewicz; Jadwiga Wybieralska

Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
299 KB
Volume
25
Category
Article
ISSN
0749-1581

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✦ Synopsis

The 13C NMR spectra of sixteen isomeric 2and 4-alkoxycarbonylalkylthiouraciIs, eight new 2.4-dialkoxycarbonylalkylthiouracils and eight isomeric 3-oxothiazolo[3,2-a]and 3-oxothiazolo[3,2-c]-pyrimidin-5-ones have been calculated and fullyassigned. The A,K empirical parameters of the 2-thio, 4-thio, 6-methy1, 2-alkoxycarbonylaIkylthio, 4-alkoxycarbonylalkyIthio, P-alkoxycarbonylalkyl, 4-alkoxycarbonylalkyl, N-3carbonylalkylthio-2-, N-3-carbonylalkylthio-4, N-3-carbonylalkyl-2-thio and N-3carbonylalkyl-4-thio groups were calculated for the predictions of the chemical shifts of substituted uracils. KEY WORDS Uracil Thiouracil Alkoxycarbonylalkylthiouracil 3-0xothiazolo[3,2-a]pyrimidin-5-ones 3-0xothiazolo[3,2-c]pyrimidin-5-ones I3C NMR Chemical shifts A,K empirical parameters.

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