𝔖 Bobbio Scriptorium
✦   LIBER   ✦

14N and 15N NMR spectroscopic characterization and analysis of cyclic sulfur imides

✍ Scribed by Tristram Chivers; Mark Edwards; Deane D. McIntyre; Kenneth J. Schmidtt; Hans J. Vogel

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
467 KB
Volume
30
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The ^14^N and ^15^N NMR spectra of natural abuadance and ^15^N‐enriched samples of S~7~NH and S~4~(NH)~4~ were obtained by direct detection and by a variety of polarization transfer techniques. Sensitivity enhancements of ca 10 (compared with direct detection) for the INEPT pulse sequence and ca 100 for the HMQC (heteronuclear multiple quantum coherence) + BIRD (bilinear rotation decoupling) sequence were observed for the imides. ^15^N spin–lattice relaxation constants (T~1~) of 10.2 Β± 0.1 and 12.6 Β± 0.1 s were determined for S~7~NH and S~4~(NH)~4~, respectively. The HMQC procedure was used to obtain the ^15^N and ^1^H NMR chemical shifts and ^1^1__J__(^15^N, ^1^H) values for 1,3‐,1,4‐ and 1,5‐S~6~(NH)~2~, 1,3,5‐ and 1,3,6‐S~5~(NH)~3~. The trends in NMR chemical shifts and coupling constants are discussed in the context of the known molecular structurts of cyclic sulfur imides. The use of NMR techniques for the analysis of mixtures of cyclic sulfur imides is compared with the well established methods of infrared spectroscopy and thin‐layer chromatography.

πŸ“œ SIMILAR VOLUMES

19F, 14N and 15N NMR spectroscopic studi
19F, 14N and 15N NMR spectroscopic studies on triazadienyl fluoride, N3F
✍ Gabriele Schatte; Helge Willner; Monika Willert-Porada πŸ“‚ Article πŸ“… 1992 πŸ› John Wiley and Sons 🌐 English βš– 456 KB

## Abstract The results of ^19^F, ^14^N and ^15^N NMR measurements for all ^14^N/^15^N isotopomers of N~3~F in CD~2~Cl~2~ solution are reported. Substantial deshielding for the N‐α and N‐γ atoms, relative to other covalent azides XN~3~ (X ο£Ύ Cl, H, CF~3~, etc.), is observed. The coupling constants a

Synthesis and NMR characterization of (1
Synthesis and NMR characterization of (15N)taurine [2-(15N)aminoethanesulfonic acid]
✍ G. Philippossian; D. H. Welti; R. Fumeaux; U. Richli; K. Anantharaman πŸ“‚ Article πŸ“… 1989 πŸ› John Wiley and Sons 🌐 French βš– 282 KB

## The t i t l e compound was prepared i n three steps w i t h 55% overall y i e l d s t a r t i n g from potassium (lSN)phthal imide. The synthetic rout e involved reaction w i t h 1,2-dibromoethane, hydrolysis of the res u l t i n g N-(2-br0moethyl)(~~N)phtha7imide w i t h HBr and treatment of the

Synthesis and spectroscopic characteriza
Synthesis and spectroscopic characterization of15N-labeled hexaaminobenzene derivatives
✍ Wolff, J. Jens ;Limbach, Hans-Heinrich πŸ“‚ Article πŸ“… 1991 πŸ› John Wiley and Sons 🌐 English βš– 347 KB

## Abstract Efficient syntheses of [^15^N~6~]‐labeled hexaaminobenzene (6), hexakis(dimethylamino)benzene (7) and 2,2β€²,2″‐trimethylbenzotris(imidazol) (1) are described. The compounds are characterized by ^15^N CPMAS NMR spectroscopy.

13C, 14N, 15N and 17O NMR spectra of nit
13C, 14N, 15N and 17O NMR spectra of nitropyrroles and nitroimidazoles
✍ E. Lippmaa; M. MΓ€gi; S. S. Novikov; L. I. Khmelnitski; A. S. Prihodko; O. V. Leb πŸ“‚ Article πŸ“… 1972 πŸ› John Wiley and Sons 🌐 English βš– 459 KB

Carbon, nitrogen and oxygen NMR spectra of some nitro derivatives of pyrrole and imidazole have been investigated. The 13C chemical shifts of para-carbons and the 170 chemical shifts of the nitro group correlate qualitatively with the electron densities on these carbon and oxygen atoms, which in tur

Phosphoric amides. 15N NMR study of the
Phosphoric amides. 15N NMR study of the Pβ€”N bonding in acyclic and cyclic compounds
✍ Agnes M. Modro; Tomasz A. Modro; Piotr Bernatowicz; Wojciech Schilf; Lech Stefan πŸ“‚ Article πŸ“… 1997 πŸ› John Wiley and Sons 🌐 English βš– 211 KB πŸ‘ 2 views

31P and 15N NMR spectra of 11 cyclic and non-cyclic phosphoramidates were measured. Comparison of the closely related structures demonstrated correlation between the bond angles at nitrogen and the 15N NMR chemical shifts and the 1J(P,N) coupling constants. 15N NMR parameters allowed the exo-and end