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Utility of 1H/2H isotope shifts for the 13C NMR assignments of indole derivatives

✍ Scribed by M. S. Morales-Ríos; P. Joseph-Nathan

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
465 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

The deuteriumllydrogen NMR isotope effects on the 13C chemical shift (DHIECS) of the cycloalkano[bjindoles 1,2,3,4-tetrahydro-9H-carbazole, 3-tert-butyl-l,2,3,4-tetrahydro-9H-carbazole and 1,2,3,4-tetrahydrocyclopent-[blindole, wherein the labile NH was partially exchanged to ND, were measured at a concentration of 0.83 M in CDCI, and in DMSO-d, solutions. The DHIECS values show defined trends that allow definitive "C NMR assignments. The isotope effects over three and four bonds for the sp3 hybridized carbons are linearly interdependent, even when one of these isotope effects becomes negative.

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