Structural and dynamical characterization of piroxicam by 1H- and 13C-NMR relaxation studies

1987 ◽  
Vol 27 (3) ◽  
pp. 255-261 ◽  
Author(s):  
Claudio Rossi ◽  
Adriana Casini ◽  
Maria Pia Picchi ◽  
Franco Laschi ◽  
Angela Calabria ◽  
...  
Keyword(s):  
13C Nmr ◽  
Nmr Relaxation ◽  
1H And 13C Nmr ◽  
Relaxation Studies

13C NMR Characterization of Polychloroprene Microstructure I. Spectral Assignments

1977 ◽  
Vol 50 (1) ◽  
pp. 49-62 ◽  
Author(s):  
M. M. Coleman ◽  
D. L. Tabb ◽  
E. G. Brame
Keyword(s):  
Nmr Spectroscopy ◽  
13C Nmr ◽  
Quantitative Data ◽  
Nmr Relaxation ◽  
13C Nmr Spectroscopy ◽  
Nmr Characterization ◽  
Relaxation Studies ◽  
Structural Irregularities ◽  
Near Future

Abstract 13C NMR spectroscopy has proved to be a very powerful tool for the characterization of polychloroprene microstructure. We have identified and assigned the lines associated with diad and triad sequences involving the predominant trans-1,4 placement, together with other lines associated with cis-1,4, 1,2, isomerized 1,2, and 3,4 structural irregularities. Currently, we are performing 13C NMR, relaxation studies on the chloroprene polymers and will be presenting quantitative data in the near future.

SYNTHESIS AND CHARACTERIZATION OF HETEROCYCLIC CHALCONES CONTAINING HALOGENATED THIOPHENES

2015 ◽  
Vol 77 (3) ◽  
Author(s):  
Helmi Mohammed Al-Maqtari ◽  
Joazaizulfazli Jamalis ◽  
Hasnah Mohd Sirat
Keyword(s):  
Sodium Hydroxide ◽  
Spectral Data ◽  
13C Nmr ◽  
Basic Medium ◽  
Synthesis And Characterization ◽  
Schmidt Reaction ◽  
Synthetic Compounds ◽  
1H And 13C Nmr ◽  
Heterocyclic Aldehydes

Heterocyclic chalcones containing halogenated thiophenes were synthesized. The first step was to synthesize 3-acetyl-2,5-dichlorothiophene and 2-acetyl-5-chlorothiophene as heterocyclic ketones by using Friedel-Crafts acylation. The ketones were then used to synthesize thiophene chalcones through Claisen-Schmidt reaction with the respective heterocyclic aldehydes such as 5-bromothiophene-2-carbaldehyde, 3-methyl-2-thiophene carboxaldehyde and 2-thiophene carboxaldehyde with 3-acetyl-2,5-dichlorothiophene or 2-acetyl-5-chlorothiophene in presence of basic medium, sodium hydroxide to form the corresponding chalcones. Structures of the synthetic compounds were confirmed by IR, MS, 1H and 13C NMR spectral data.

scholarly journals Synthesis and spectral characterization of novel 1,5-benzodiazepine oxime derivatives

2019 ◽  
Vol 84 (4) ◽  
pp. 343-353
Author(s):  
Lina Rekovic ◽  
Lidija Kosychova ◽  
Irina Bratkovskaja ◽  
Regina Vidziunaite
Keyword(s):  
Nitrogen Atom ◽  
Fluorescence Spectroscopy ◽  
Organic Solvent ◽  
Elemental Analysis ◽  
13C Nmr ◽  
1H And 13C Nmr ◽  
Methyl Group ◽  
Oxime Derivatives ◽  
New Compounds

Three new 1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-2-one oximes were synthesized and characterized by the methods of 1H- and 13C-NMR, IR and elemental analysis. Along with previously described compounds bearing one additional methyl group on the 5th nitrogen atom, the new compounds were characterized in bulk by UV?Vis and fluorescence spectroscopy in various solvents. The influence of the nature of the organic solvent on the spectra of the title compounds was investigated and is discussed.

scholarly journals Spectral density mapping at multiple magnetic fields suitable for 13C NMR relaxation studies

2016 ◽  
Vol 266 ◽  
pp. 23-40 ◽  
Author(s):  
Pavel Kadeřávek ◽  
Vojtěch Zapletal ◽  
Radovan Fiala ◽  
Pavel Srb ◽  
Petr Padrta ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Spectral Density ◽  
13C Nmr ◽  
Nmr Relaxation ◽  
Density Mapping ◽  
Relaxation Studies ◽  
Spectral Density Mapping

Pretreatment of anaerobic digester samples by hydrochloric acid for solution-state 1H and 13C NMR spectroscopic characterization of organic matter

Chemosphere ◽  
2018 ◽  
Vol 199 ◽  
pp. 201-209 ◽  
Author(s):  
Sepehr Shakeri Yekta ◽  
Mattias Hedenström ◽  
Jan Eric Stehr ◽  
Mårten Dario ◽  
Norbert Hertkorn ◽  
...  
Keyword(s):  
Organic Matter ◽  
Hydrochloric Acid ◽  
13C Nmr ◽  
Spectroscopic Characterization ◽  
Anaerobic Digester ◽  
1H And 13C Nmr ◽  
Solution State
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