𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Conformational studies of diastereoisomeric cyclo(alanyl-phenylalanyl) with the coupling constants 1H–1H, 15N–1H, 13C–1H, and 13C–15N

✍ Scribed by Jaroslav Vicar; Karel Blaha; François Piriou; Michel Juy; Hung Lam-thanh; Serge Fermandjian

Publisher
Wiley (John Wiley & Sons)
Year
1982
Tongue
English
Weight
509 KB
Volume
21
Category
Article
ISSN
0006-3525

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The cyclodipeptides cyclo(L‐alanyl‐L‐phenylalanyl) and cyclo(D‐alanyl‐L‐phenylalanyl) were synthesized with various atoms substituted by the isotopes ^15^N and ^13^C. Thus, the coupling constants ^15^N–^1^H, ^13^C–^1^H, and ^13^C–^15^N could be obtained, in addition to the commonly used ^1^H–^1^H constants. The applicability of these coupling constants for obtaining conformational information on side chains and substituted 2,5‐piperazinedione rings is discussed.

📜 SIMILAR VOLUMES

15N1H and 15N–13C couplings in 15N-enric
15N1H and 15N–13C couplings in 15N-enriched dihydroxamic acids
✍ Jan Schraml; Petr Cigler 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 202 KB

## Abstract ^15^N‐enriched dihydroxamic acids (HONHCO(CH~2~)~__n__~CONHOH, __n__ = 0, 1, and 2) were prepared and their spectra NMR (^1^H, ^13^C, ^15^N) recorded in dimethyl sulfoxide (DMSO) solutions with the aim of determining ^15^N coupling constants (^15^N^1^H and ^15^N^13^C). The results sup

Applicability of vicinal heteronuclear (
Applicability of vicinal heteronuclear (13C-1H, 15N-1H, 13C-15N) coupling constants for conformational analysis of amino acids: Phenylalanine, α-aminobutyric acid and β-alanine
✍ Bozhana P. Mikhova; Mario F. Simeonov; Stefan L. Spassov 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 335 KB

The vicinal "G'H, "N-'H and %-"N spin coupling constants were obtained from the 'H and =C NMR spectra of various ionic forms of the amino acids phenylalanine, a-aminobutyric acid and p-alanine, and also from their "N isotopomers. It is concluded that the "C-'H and =N-lH coupling constants are reliab

1H, 13C and 15N NMR study of N1-alkyl-N2
1H, 13C and 15N NMR study of N1-alkyl-N2-arylthioureas
✍ Iwona Wawer; Vera Koleva 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 407 KB

## Abstract ^13^C and ^15^N NMR chemical shifts were measured for __N__^1^‐alkyl‐__N__^2^‐arylthioureas. The absence of decoalescence of the __N__^1^‐alkyl group carbon signals down to 190 K, the europium‐induced chemical shifts and the molecular mechanics calculations indicate that the preferred c

13C-15N Connectivity networks via unsymm
13C-15N Connectivity networks via unsymmetrical indirect covariance processing of 1H-13C HSQC and 1H-15N IMPEACH spectra
✍ Gary E. Martin; Bruce D. Hilton; Patrick A. Irish; Kirill A. Blinov; Antony J. W 📂 Article 📅 2007 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 349 KB

## Abstract magnified image Long‐range ^1^H‐^15^N heteronuclear shift correlation methods at natural abundance to facilitate the elucidation of small molecule structures have assumed a role of growing importance over the past decade. Recently, there has also been a high level of interest in the ex

1H, 13C and 15N NMR spectra of ciproflox
1H, 13C and 15N NMR spectra of ciprofloxacin
✍ Andrzej Ziȩba; Andrzej Maślankiewicz; Jerzy Sitkowski 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 103 KB

## Abstract ^1^H NMR assignment, including the values of δ~H~ and __J__(H,H) for the cyclopropane moiety, and ^13^C NMR and ^15^N NMR spectral data for ciprofloxacin are presented. Copyright © 2004 John Wiley & Sons, Ltd.

1H, 13C and 15N NMR spectra of [1,2-15N2
1H, 13C and 15N NMR spectra of [1,2-15N2]pyrazole derivatives
✍ Alain Fruchier; Valdo Pellegrin; Rosa Maria Claramunt; Jose Elguero 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 199 KB

## REFERENCE DATA carbons, for various substituent groups and positions were carried out by gated decoupling with NOE. ## RESULTS AND DISCUSSION The I3C NMR chemical shifts of the compounds are shown in Tables 123; 'J(CH) and long-range coupling constants of 2, 9, 13 and 18, measured by gated d