The carboxylic acid proton and the lithium coordination environments for precise and random Li-neutralized polyethylene acrylic acid P(E-AA) ionomers were explored using high speed solid-state H and Li MAS NMR. While the Li NMR revealed only a single Li coordination environment, the chemical shift temperature variation was dependent on the precise or random nature of the P(E-AA) ionomer. The H ...

Oligosaccharides were prepared through mild hydrochloric acid hydrolysis of -carrageenan from Kappaphycus striatum carrageenan. Three oligosaccharides were purified by strong-anion exchange high-performance chromatography. Their structure was elucidated using mass spectral and NMR data. Negative-ion electrospray ionization (ESI) mass spectra at different fragmentor voltages provided the molecul...

Laboratorium für Anorganische Chemie der Universität Bayreuth, Postfach 101251, D-8580 Bayreuth Z. Naturforsch. 42b, 703-706 (1987); received January 15, 1987 Reverse 2D 'H{N} NMR Spectra, Phosphane Complexes, Inorganic Ring System PS2N3, X-Ray The inorganic ring system RPNSNSNH linked to the [Cr(CO)5] fragment [R = T3u (1), NH2 (2)], has been studied by reverse two-dimensional, 2D , 'H{N} NMR ...

Two new dihydrostilbenes, stilbostemins H (1), I (2), and a new dihydrophenanthrene, stemanthrene E (3), were isolated and identified from the roots of Stemona sessilifolia, together with known stilbostemins B, D and G, and stemanthrenes A and C (4-8). Structures of new stilbenoids were established by 1D and 2D (1)H NMR and (13)C NMR spectroscopic analyses.

Abstract In this paper, the epoxy value of resin TDE-85 was measured by proton nuclear magnetic resonance ( 1 H-NMR) spectroscopy and tetraethylammonium bromide titration. Comparisons measurement results repeatability two methods show that NMR can be used to measure TDE-85. However, because high requirements for sample purity, when testing containing impurities, is worse than

The title compound, C(13)H(12)BrNO(4), was obtained from an optically active aniline derivative. The structure was characterized by (1)H NMR, (13)C NMR, MS and X-ray diffraction techniques. 86% of the atoms of the two independent mol-ecules in the asymmetric unit show non-crystallographic inversion symmetry.

A series of novel 1-[(2,6-dichloro-4-trifluoromethyl)phenyl]-3-aryl-¹H-pyrazole-4-carbaldehydes were synthesized using the Vilsmeier-Haack reagent. The structures of all the title compounds have been confirmed by elemental analysis, ¹H-NMR and ¹³C-NMR and in addition, the structure of intermediate 5b was investigated by X-ray crystallography.

We demonstrate the application of Compressed Sensing-NMR to decrease the data acquisition time of 2D COSY NMR from >5 h to ∼1.5 h such that the kinetics of a reaction are followed, along with identification of intermediate and product species.