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    STUDIA CHEMIA - Issue no. 2 / 2003  
         
  Article:   EI-MS UNIDIRECTIONAL TRIPLE HYDROGEN REARRANGEMENT. I. THE CASE OF LONG CHAIN PHENYLAZOBENZOATES.

Authors:  IOAN OPREAN, BIANCA MOLDOVAN, RADU OPREAN.
 
       
         
  Abstract:  The aim of our study was to determine the various hydrogen rearrangements in the mass spectra of some long chain esters. We demonstrated that in the EI-MS spectra of long chain phenylazobenzoates appears a triple hydrogen rearrangement ion because of the migration of the hydrogen from the hydrocarbonated part to the phenyl rest of the molecule if the chain has more than 8 carbon atoms. The abundance of this ion proceeds to the extent of 0,5% to 70% of the basis peak of the mass spectrum and it exhibits an increase with the increase of the chain length.  
         
     
         
         
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