Proton nuclear magnetic resonance spectrometry for determination of substituents and their distribution in carboxymethylcellulose

1980 ◽  
Vol 52 (6) ◽  
pp. 913-916 ◽  
Author(s):  
Floyd F. L. Ho ◽  
Daniel W. Klosiewicz
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Proton Nuclear Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectrometry ◽  
Magnetic Resonance Spectrometry ◽  
Nuclear Magnetic

scholarly journals Identification and Determination of the Isomeric Bromo- and/or Chloro-Substituted l,3-Dihalo-5,5- Dimethylhydantoins Used in Disinfectants and Molluscicides

1996 ◽  
Vol 79 (4) ◽  
pp. 823-828 ◽  
Author(s):  
Jon Beihoffer ◽  
Ed Bour ◽  
Joe H Lowry ◽  
John J Reschl ◽  
Jivbmy L Seidel ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
1H Nmr ◽  
Proton Nuclear Magnetic Resonance ◽  
Technical Grade ◽  
Nuclear Magnetic Resonance Spectrometry ◽  
Magnetic Resonance Spectrometry ◽  
Materials Used ◽  
Nuclear Magnetic

Abstract Proton nuclear magnetic resonance spectrometry (1H NMR) was used to identify and quantitate the 4 isomeric bromo- and/or chloro-substituted 1,3-dihalo-5,5-dimethylhydantoins in technical-grade materials used to prepare commercial disinfectants and molluscicides. We found that the technical grades of bromo/chloro-substituted 1,3-dihalo-5,5-dimethylhydantoins are mixtures of the 4 possible isomers, that interconversion among isomers occurs in solution and can be detected by 1H NMR, and that isomer interconversion occurs over times greater than those of the NMR timescale.

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