scholarly journals Characterization of uniformly and atom-specifically 13C-labeled heparin and heparan sulfate polysaccharide precursors using 13C NMR spectroscopy and ESI mass spectrometry

2010 ◽  
Vol 345 (15) ◽  
pp. 2228-2232 ◽  
Author(s):  
Thao K.N. Nguyen ◽  
Vy M. Tran ◽  
Xylophone V. Victor ◽  
Jack J. Skalicky ◽  
Balagurunathan Kuberan
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Heparan Sulfate ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Esi Mass Spectrometry

scholarly journals (2S,3R,6R)-2-[(R)-1-Hydroxyallyl]-4,4-dimethoxy-6-methyltetrahydro-2H-pyran-3-ol

Molbank ◽  
10.3390/m1140 ◽  
2020 ◽  
Vol 2020 (2) ◽  
pp. M1140
Author(s):  
Jack Bennett ◽  
Paul Murphy
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Ir Spectroscopy ◽  
13C Nmr ◽  
Conjugate Addition ◽  
13C Nmr Spectroscopy ◽  
One Pot ◽  
1H And 13C Nmr ◽  
Esi Mass Spectrometry ◽  
The One

(2S,3R,6R)-2-[(R)-1-Hydroxyallyl]-4,4-dimethoxy-6-methyltetrahydro-2H-pyran-3-ol was isolated in 18% after treating the glucose derived (5R,6S,7R)-5,6,7-tris[(triethylsilyl)oxy]nona-1,8-dien-4-one with (1S)-(+)-10-camphorsulfonic acid (CSA). The one-pot formation of the title compound involved triethylsilyl (TES) removal, alkene isomerization, intramolecular conjugate addition and ketal formation. The compound was characterized by 1H and 13C NMR spectroscopy, ESI mass spectrometry and IR spectroscopy. NMR spectroscopy was used to establish the product structure, including the conformation of its tetrahydropyran ring.

scholarly journals Synthesis and Characterization of New Silver (I) N-Heterocyclic Ccarbene Ccomplex Dderived from Imidazol-2-ylidene salt

2018 ◽  
Vol 28 (2) ◽  
pp. 55
Author(s):  
Mohammedl Mujbe Hasson
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
13C Nmr ◽  
Room Temperature ◽  
13C Nmr Spectroscopy ◽  
Synthesis And Characterization ◽  
Imidazolium Salt ◽  
In Situ Method

A new N, N'-imidazolium salt 1-(2,6-diisopropylphenyl)-3- (4,6-dimorpholino -1,3,5-traizine-2-yl)-1H-imidazol-3-ium chloride) as a precursor of N - heterocyclic carbene ligand was prepared via the reaction of 1 - (2, 6 - diisopropyl phenyl - 1H - imidazole) with 1, 3, 5 - triazine derivative bearing morpholine substituent (2, 6 -dimorpholine - 6- chloro-1, 3, 5-triaziazine). Linear coordi-nated Ag (І) NHC complex was synthesised via deprotonation of the imidazolium salt and reac-tion with Ag2O in darkness at room temperature by in situ method. The complex was synthesised for using as transfer agent to prepare another transition metals complexes by transmetallation method in the future. The imidazolium salt and their silver complex have been characterized by 1 H and 13C NMR spectroscopy as well as mass spectrometry.

scholarly journals Synthesis and characterization of 2-pyridineformamide 3-pyrrolidinylthiosemicarbazone

2013 ◽  
Vol 29 ◽  
pp. 28-33
Author(s):  
B. Shakya ◽  
P. N. Yadav
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrum ◽  
Nmr Spectroscopy ◽  
13C Nmr Spectroscopy ◽  
Synthesis And Characterization ◽  
Ionization Mass ◽  
Transamination Reaction ◽  
Ionization Mass Spectrum ◽  
Esi Mass Spectrometry

Pyrrolidine-1-carbothiohydrazide was prepared by the transamination reaction of 4-methyl-4-phenyl-3-thiosemicarbazide with pyrrolidine in MeCN. 2-pyridineformamide 3-pyrrolidinyl-thiosemicarbazone (HAmPyrr) was synthesized by the reduction of cyanopyridine in the presence of pyrrolidine-1-carbothiohydrazide in MeOH with Na metal. The synthesized compound was characterized by elemental analysis, IR, 1H-NMR, 13C-NMR spectroscopy and ESI mass spectrometry. The prominent (M+1) peak (m/z) of HAmPyrr in the electron spray ionization mass spectrum was found at 250.09 which correspond to the molecular ion plus H. DOI: http://dx.doi.org/10.3126/jncs.v29i0.9234Journal of Nepal Chemical SocietyVol. 29, 2012Page: 28-33Uploaded date : 12/3/2013

scholarly journals CARBOXYMETHYLATION OF POLYSACCHARIDES – A COMPARATIVE STUDY

2020 ◽  
Vol 54 (9-10) ◽  
pp. 835-844
Author(s):  
GABRIEL LARS ◽  
ANTJE TIED ◽  
THOMAS HEINZE
Keyword(s):  
Nmr Spectroscopy ◽  
Caustic Soda ◽  
Comparative Study ◽  
13C Nmr ◽  
Reaction Medium ◽  
13C Nmr Spectroscopy ◽  
Water Soluble

The present study describes the heterogeneous carboxymethylation of xylan,α-1,3-glucan, glucomannan, pullulan, curdlan, galactoglucomannan, and agarose with sodium monochloracetate (SMCA) using iso-propanol as slurry medium in the presence of caustic soda. Using heteropolysaccharides for the carboxymethylation, higher DS values are obtained compared to the DS of homopolysaccharides. The influence of the amount caustic soda in the reaction medium is studied. The characterization of the products obtained is performed by means of 13C-NMR spectroscopy. Carboxymethylation transforms the investigated polysaccharides into water-soluble products.

Characterization of cellulose and cellulose derivatives in solution by high resolution 13C-NMR spectroscopy

1994 ◽  
Vol 19 (1) ◽  
pp. 29-78 ◽  
Author(s):  
Irene Nehls ◽  
Wolfgang Wagenknecht ◽  
Burkart Philipp ◽  
Dorothea Stscherbina
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Cellulose Derivatives
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