scholarly journals Complete Assignment of the 1H and 13C NMR Spectra of Carthamin Potassium Salt Isolated from Carthamus tinctorius L.

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4953
Author(s):  
Maiko Sasaki ◽  
Keiko Takahashi
Keyword(s):  
Potassium Salt ◽  
Nmr Spectra ◽  
Carthamus Tinctorius ◽  
Ionization Mass ◽  
1H And 13C Nmr ◽  
13C Nuclear Magnetic Resonance ◽  
Complete Assignment ◽  
Pure Product ◽  
Atomic Adsorption Spectroscopy ◽  
Nmr Signals

Carthamin potassium salt isolated from Carthamus tinctorius L. was purified by an improved traditional Japanese method, without using column chromatography. The 1H and 13C nuclear magnetic resonance (NMR) signals of the pure product were fully assigned using one- and two-dimensional NMR spectroscopy, while the high purity of the potassium salt and deprotonation at the 3′ position of carthamin were confirmed by atomic adsorption spectroscopy and nano-electrospray ionization mass spectrometry.

scholarly journals Complete Assignment of the 1H and 13C NMR Spectra of Carthamin Potassium Salt Isolated from Carthamus Tinctorius L.

2021 ◽  
Author(s):  
Maiko Sasaki ◽  
Keiko Takahashi
Keyword(s):  
Potassium Salt ◽  
Nmr Spectra ◽  
Carthamus Tinctorius ◽  
Ionization Mass ◽  
13C Nuclear Magnetic Resonance ◽  
Complete Assignment ◽  
Pure Product ◽  
Atomic Adsorption Spectroscopy ◽  
Nmr Signals ◽  
C Nmr

Carthamin potassium salt isolated from Carthamus tinctorius L. was purified by an improved traditional Japanese method, without using column chromatography. The 1H and 13C nuclear magnetic resonance (NMR) signals of the pure product were fully assigned using one- and two-dimensional NMR spectroscopy, while the high purity of the potassium salt and deprotonation at the 3’ position of carthamin were confirmed by atomic adsorption spectroscopy and nano-electrospray ionization mass spectrometry.

scholarly journals Trifluoroacetylation of Alcohols During NMR Study of Compounds with Bicyclo[2.2.1]heptane, Oxabicyclo[3.3.0]octane and Bicyclo[3.3.0]octane Skeleton

2021 ◽  
Vol 72 (2) ◽  
pp. 156-177
Author(s):  
Constantin I. Tanase ◽  
Anamaria Hanganu ◽  
Constantin Draghici
Keyword(s):  
Nmr Spectra ◽  
Cyclopropane Ring ◽  
Secondary Alcohol ◽  
Primary Alcohol ◽  
1H And 13C Nmr ◽  
Alcohol Group ◽  
Nmr Study ◽  
Group A ◽  
Graphical Presentation ◽  
Nmr Signals

TFA was added to a solution of a bicyclo[2.2.1]heptane azide-alcohol in CDCl3 to correctly characterize the compound, but during 24 h gave the trifluoro acetylated compound in quantitative yield. NMR spectra of the esterified compound helped us also to correctly attribute the NMR signals to the protons, and also confirmed the identification of the carbon atoms. The study was extended to other 14 compounds containing a primary alcohol group alone or with an ethylene ketal, a δ- or -lactone group, a primary and a secondary group, two primary and an alkene group and two primary and a secondary alcohol groups on scaffolds containing bicyclo[2.2.1]heptane, oxabicyclo[3.3.0]octane, bicyclo [2.2.1]heptane constrained with a cyclopropane ring and bicyclo[3.3.0]octane fragments. The esterification of all compounds was also quantitative in 24 to 72 h; this helped us to correct attribute the NMR signals to the protons and carbon atoms of the un-esterified compounds by comparison with those of the trifluoro acetylated compounds. A graphical presentation of 1H- and 13C-NMR spectra of a few un-esterified and esterified compounds are presented in the paper.

Synthesis and complete assignment of the 1H and 13C NMR signals of new acetamido and aminoflavonoid derivatives

2010 ◽  
Vol 48 (9) ◽  
pp. 738-744
Author(s):  
Gilles Casano ◽  
Maxime Robin ◽  
Pascale Barbier ◽  
Vincent Peyrot ◽  
Robert Faure
Keyword(s):  
13C Nmr ◽  
1H And 13C Nmr ◽  
Complete Assignment ◽  
Nmr Signals

Synthesis and complete assignment of the 1H and 13C NMR spectra of 6-substituted and 2,6-disubstituted pyridazin-3(2H)-ones

2011 ◽  
Vol 49 (7) ◽  
pp. 437-442 ◽  
Author(s):  
Pedro Besada ◽  
Tamara Costas ◽  
Noemi Vila ◽  
Carla Chessa ◽  
Carmen Terán
Keyword(s):  
13C Nmr ◽  
Nmr Spectra ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr ◽  
Complete Assignment

Complete assignment of the 1H and 13C NMR spectra of antimicrobial 4-arylamino- 3-nitrocoumarin derivatives

2010 ◽  
Vol 48 (11) ◽  
pp. 896-902 ◽  
Author(s):  
Vidoslav Dekić ◽  
Niko Radulović ◽  
Rastko Vukićević ◽  
Biljana Dekić ◽  
Danielle Skropeta ◽  
...  
Keyword(s):  
13C Nmr ◽  
Nmr Spectra ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr ◽  
Complete Assignment

scholarly journals SYNTHESIS, COMPLETE ASSIGNMENT OF 1H- AND 13C-NMR SPECTRA AND ANTIOXIDANT ACTIVITY OF NEW AZINE DERIVATIVE BEARING COUMARIN MOIETY

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Milenko Ristić ◽  
Biljana Dekić ◽  
Niko Radulović ◽  
Marija Aksić
Keyword(s):  
Antioxidant Activity ◽  
13C Nmr ◽  
Nmr Spectra ◽  
2D Nmr ◽  
13C Nmr Spectra ◽  
Target Compound ◽  
1H And 13C Nmr ◽  
Dpph Method ◽  
Complete Assignment ◽  
Hydrazone Derivative

In this research, the synthesis of a new azine derivative with coumarin moiety was performed in three reaction steps, starting from 4-hydroxycoumarin. The first step in synthesis was the acetylation of 4-hydroxycoumarin to yield 3-acetyl-4-hydroxycoumarin and then the obtained 3-acetyl-4-hydroxycoumarin was reacted with hydrazine hydrate and give a corresponding hydrazone. Condensation of the hydrazone with 4-ethoxy-3-methoxybenzaldehyde afforded the target compound 1-[1-(4-hydroxy-2-oxo-2H-chromen-3-yl)-ethylidene]-2-(4-etoxy-3-methoxybenzylidene)-hydrazine in a good yield. The resulting azine derivative is fully spectrally characterized, including complete assignment of 1H- and 13C-NMR spectra, as well as 2D NMR (1H-1H COSY, NOESY, HSQC and HMBC) spectra. The antioxidant activity of corresponding hydrazone and target compound was evaluated by DPPH method where hydrazone derivative displayed a significant and target azine good antioxidant activity, with IC50 (μM) values 11.69 and 216.60, respectively.

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