𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A 13C and 183W NMR study of the structures of tungstate and molybdate complexes of volemitol

✍ Scribed by Stella Chapelle; Jean-François Verchère

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
829 KB
Volume
266
Category
Article
ISSN
0008-6215

No coin nor oath required. For personal study only.

✦ Synopsis

~H, '3(2, and ~s3W NMR spectroscopic methods were used for the structural characterization of the tungstate and molybdate complexes of volemitol (u-glycero-D-manno-heptitol) in aqueous solution.

The major species (type E) are a pair of isomeric complexes formed at the arabino site in reversed orientation, i.e., HO-1,2,3,4 and HO.4,3,2,1. A single, minor complex is formed at the HO-3,4,5,6 altro site and is shown to be isostructural with the known single complexes of ribitol and D-altritol (type E'). The present NMR results support tile hypothesis that complexes of type E' are weaker than those of type E because they are destabilized by a steric strain due to the interaction of the side chain of the ligand with the site of chelation.

📜 SIMILAR VOLUMES

A 13C and 183W NMR study of d-glycero-d-
A 13C and 183W NMR study of d-glycero-d-gulo-heptonic acid as a multisite ligand in tungstate complexes
✍ Miloudi Hlaïbi; Mohammed Benaïssa; Catherine Busatto; Jean-François Verchère; St 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 647 KB

The formation of complexes (x,y, z) between x tungstate ions, y o-glycero-D-gulo-heptonate ions, and z protons was studied in aqueous solution by ~3C and ZS3W NMR spectroscopy. The overall equilibrium constant for the complex-forming reaction was obtained by a competition method, showing that a (2,2

A multinuclear NMR spectroscopy study of
A multinuclear NMR spectroscopy study of the tungstate and molybdate complexes of d-fructose and l-sorbose
✍ Jean-Paul Sauvage; Jean-François Verchère; Stella Chapelle 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 486 KB

The formation of dinuclear tungstate and molybdate complexes of D-fructose and L-sorbose was studied in aqueous solution by I H, ~3C, and ~83W NMR spectroscopy. These ketoses react only in acyclic forms, because HO-3,4 are trans in the cyclic lbrms. With tungstate, both sugars form a major complex o

183W NMR study of alkenylcarbyne– and al
183W NMR study of alkenylcarbyne– and alkenylvinylidene–tungsten complexes
✍ Rodrigo J. Carbajo; Lei Zhang; Fernando López-Ortiz 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 307 KB

183W NMR data are reported for a series of alkenylvinylideneÈ and alkenylcarbyneÈtungsten complexes of the type and [(dppe)(CO) 3 WxCxCHR], [(dppe)(CO) 3 WyCwCHxCR 2 ]`BF 4 [dppe \ 1,2-bis(diphenylphosphino)ethane]. Spectra were recorded using [(dppe)(CO) 2 LWyCwCHxCR 2 ] inverse 2D 1H,183Wand 31P,1

Multinuclear 183W and 13C NMR and indire
Multinuclear 183W and 13C NMR and indirect photometry study for the identification and the characterization of new complexes of sugar acids
✍ Miloudi Hlaïbi; Mustapha Hor; Mohamed Riri; Abdelkhalek Benjjar; Jean-François V 📂 Article 📅 2009 🏛 Elsevier Science 🌐 English ⚖ 491 KB

Multinuclear 13 C and 183 W NMR Sites of chelation Lactic type complexes Erythro and threo type complexes a b s t r a c t Colourless tungstate complexes of the sugar acids, L-manonnic, D-glucaric and galactaric acids have been studied in aqueous solutions. Multinuclear 13 C and 183 W NMR have been

Furanose vs. acyclic forms of carbohydra
Furanose vs. acyclic forms of carbohydrate ligands. A multinuclear NMR spectroscopy study of the molybdate and tungstate complexes of d-glycero-l-manno-heptose
✍ Maria Matulová; Jean-François Verchère; Stella Chapelle 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 590 KB

The formation of dinuclear tungstate and molybdate complexes of D-glycero-L-manno-heptose was studied in aqueous solution by J3C and t83W NMR spectroscopy. The chelating aldose is always tetradentate and occurs exclusively in furanose or acyclic hydrated forms, the proportions of which depend on the

The structure of silychristin - a 13C-NM
The structure of silychristin - a 13C-NMR study
✍ Hildebert Wagner; V.Mohan Chari; Maria Seitz; Ingrid Riess-Maurer 📂 Article 📅 1978 🏛 Elsevier Science 🌐 French ⚖ 225 KB

Silychristin, a component of the antihepatotoxic Silymarin from Silybum,marianum fruits, was assigned the structure 1 by Wagner et al. 1) on the basis of