Use of the1H Nuclear Magnetic Resonance Spectra Signals from Polyphenols and Acids for Chemometric Characterization of Cider Apple Juices

2006 ◽  
Vol 54 (8) ◽  
pp. 3095-3100 ◽  
Author(s):  
Gloria Del Campo ◽  
J. Ignacio Santos ◽  
Nuria Iturriza ◽  
Iñaki Berregi ◽  
Arantxa Munduate
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

scholarly journals Synthesis and Characterization of a Trifunctional Photoinitiator Based on Two Commercial Photoinitiators with α-Hydroxyl Ketone Structure

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5272
Author(s):  
Rong Zhong ◽  
Hui Hu ◽  
Yanfang Zhou
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Proton Nuclear Magnetic Resonance ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

A trifunctional photoinitiator based on commercial photoinitiators 2-hydroxy-2-methylpropiophenone (Irgacure1173) and 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone (Irgacure2959) was synthesized by an esterization reaction. Its structure was characterized by UV-Vis spectrometry, Infrared Transformed Fourier, Proton Nuclear Magnetic Resonance Spectra, 13 Carbon Nuclear Magnetic Resonance Spectra, Mass Spectrometry, and Thermogravimetry. In addition, its photoinitiating activity was investigated. The results showed that the novel photoinitiator had good photoinitiating activity and thermal stability compared to commercial photoinitiators. The migration of the residual photoinitiator in the cured film was lower than that of 1173 and 2959.

Chemistry of the aminochromes. Part X. Some further observations on the reactions of aminochromes with thiols

1969 ◽  
Vol 47 (3) ◽  
pp. 467-476 ◽  
Author(s):  
W. Powell ◽  
R. A. Heacock ◽  
G. L. Mattok ◽  
D. L. Wilson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The reactions between aminochromes and thiols have been reinvestigated. In general aminochromes react with thiols to give mixtures of products including: 5,6-dihydroxyindoles; thio-substituted 5,6-dihydroxyindoles (the mercapto residue is now considered to be in the 4-position of the indole nucleus and not the 7-position as previously reported); and relatively unstable addition products formed between the aminochrome and the thiol. The mechanisms by which these compounds are formed are discussed. The characterization of three thio-substituted 5,6-dihydroxyindoles by nuclear magnetic resonance spectroscopy is described. The nuclear magnetic resonance spectra of a number of 5,6-diacetoxyindole derivatives are reported.

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