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Signs of spin-spin interaction constants in trans-acetylformamide-15N

✍ Scribed by G. A. Kalabin; V. F. Bystrov; E. V. Shepelev; S. N. Shvedova; O. V. Lebedev; L. I. Khmel'nitskii

Book ID: 112433048
Publisher: Springer
Year: 1969
Tongue: English
Weight: 51 KB
Volume: 18
Category: Article
ISSN: 1573-9171
DOI: 10.1007/bf00906550

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## Abstract By using digital deconvolution to improve spectral resolution, earlier NMR studies on ^15^N‐enriched acetamide have been revised and extended to determine the signs of the heteronuclear spin‐spin coupling constants. ^1^__J__(^13^CO^15^N), ^2^__J__(^13^CH~3~^15^N) and ^3^__J__(C^1^H~3~^1

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The sign 'J(NN) of 2-chlor0-6-methyl-['~N,]pyrimidine has been determined by 'H-('H (selective), "N (selective)} and 13C-(1H (noise), I5N (selective)} triple resonance techniques. The sign was proved to be negative (-1.6 Hz); consequently, chlorine substitution at C-2 was found to make ' . I ( " ) m